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I'm very doubtful hosting the video off-site would have much effect on the site speed especially YouTube, Personally I use Wistia mainly due to the level of analytics that they provide.  The only time this may be an issue if you have a quantity on a single page, in that case I would try and split it onto several different pages by means of categories or something.

To me it sounds like there may be a programming problem.

The other thing is it may not be the videos that is slowing the site down.

Just a few thoughts don't know if it helps.

As Sean said this is done using structured data (aka schema markup), You can also use the data highlighter in Google search console, although it is preferable to do a proper job and use schema markup.

Firstly, sounds like you do have a penalty of some sort.

Secondly, I would not have redirected the hacked pages back to the site anywhere, you could give yourself a penalty that way. You could be passing bad authority or worse from anywhere else on the web, completely out of your control.

Thirdly, don't discount the potential of a website problem. Broken script, user damage, another hack etc

1. Do a thorough link cleanup.

2. Consider taking down any pages that are not relevant or earning any value.

3. Check search console for any notifications or manual penalties.

4. Check the website for performance and functionality.

Yes, definitely duplicate content could be your problem.  I would also recommend you do a back link audit.

Also the main page content looks quite sparse (sorry, I know it property took you ages.  But it's worthwhile beefing it out, if you've got a few minutes spare).

Strongly recommend you do a full site audit from the ground up and include both on and off page.

Relevancy is hard to determine, I wouldn't stress too much about it, but you do need to make sure it is on topic.

For instance, if you are trying to rank for "4WD for sale" and you link out to a topic about astronomy that's clearly not relevant.

The determining factor, is your outbound link going to be useful to the reader? If yes include it, if not don't.

Sorry just a question, where are you getting your back links list from? It's not unknown for tools to be inaccurate.

Another point I forgot to mention, Moz did update their index in the past few days, lots of people have seen a DA drop.

This is down to the way Google search works, but there seems to have been an increase recently on this sort of thing.  It is mostly about Google trying to identify the best results for the best user, results are getting increasingly dynamic.

I don't believe it's anything to worry about, if you clear the cache on the different PCs the chances are you will find the results will even out and be reading about the same each time, there will normally vary slightly anyway.

The alternative is to use an online checker.

P.S. Make sure you are logged out of Google also prior to clearing the cache.

Trust that helps.

All the best.

Providing you've got a separator (like a hyphen) it shouldn't make any difference. I will be more concerned about the grammar and how it looks to the searcher.
If it was me and I was using it to separate two different phrases I would make sure it had spaces either side. However, if it's a hyphenated word it wouldn't make sense to use spaces.

Mello Matt,

If it was my site I would seriously consider getting rid of any redirects from old dodgy pages, you could force Google to consider for the content still exists.  If it goes to a 404 Google can then see clearly it no longer exists.
But would be interesting on what others have to say on that.

I would source my back links mainly from Google search console.

Hope that helps.

Keep a backup and remove them.

Search engines are only going to look at the file which is exactly called robots.txt variations of file name will be ignored.

Do make sure the entries are correct in the main one though, you don't want Google crawling admin pages or other confidential areas of the site.

Be very careful about changing hierarchy or structure.  It does have an effect on where the pages rank.

Any pages that are ranking well (i.e. position 0 to 5) don't even touch them, in fact anything on the first page I would be slow to alter without very good reason.

Anything that is on the second page or worse you haven't got a lot to lose, so restructuring probably would make sense.

Seems like some of the big sides only give no-follow links now are they still useful for building link authority?

Do you have any experience?

Thanks

You need to be aware DA is secondary to your question, that is DA has to do with back link quality and URLs have to do with the search engine and users be unable to find what they're looking for.

The URL structure should be clean easy to read and easy to navigate.  I won't be overly worried about the length although keep it to a minimum where possible like the following: www.domain.com/products/air-conditioning/portable-air-conditioner-unit

Does CDN impact on SEO or not?

There seems conflicting ideas as to whether they impact positively or negatively, I realise that if the page loads quicker this is a good thing for SEO and usability of course.

Does Google see CDN as just cheating and a get-around for not doing the work from the ground up and using good hosting etc?

Do you have any direct experience?

All constructive input much appreciated!

I have had a client come and ask me to do some link building, they are wanting to use a strategy of buying expired domains and creating a single page website with some keyword links back to the main website.

Seems like an old idea at best, has anyone used it or is it risky

I wouldn't divert them to the homepage, the content has to be relevant.  As Tim says keep them or redirect/create a page that does have relevant content.  
Like Advice/comparisons/alternatives

Does Google take any notice of nofollow links, they seem to count for something but don't know how much.
Any experience?

Have a look at how Moz now calculates the spam score, it is done based on correlation with characteristics of other band websites.

That is to say just because it's a high spam score doesn't mean to say it's going to do you damage.

However I always steer completely clear of any indication of spam.

I would consider 20% plenty high enough, at 40% I would completely avoid it and put my effort elsewhere.

Agree with ThompsonPaul to me it sounds like it could be more of a technical problem, Did you change any settings in that time period?

A lot of people have been implementing HTTPS and pop-up windows for collecting email addresses, if you've done anything like that check them thoroughly for errors, get some third parties to check also.

If your site is all good and accessible then that would point to "Fred" as previously mentioned.

If you are talking about Google Site Search / Google Custom Search Engine it is being discontinued.  See https://cse.google.com/cse/

You will probably find it start showing ads and all sorts of funny things.