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From what I can see you have entered the ring with the heavyweights. This is a techsavvy niche and the people you are challenging work really smart and really hard.  And they have been doing that for a long time. I pay very little attention to DA, PA, etc.  Instead I look at the content of the site and the buzz about the biz.     To beat them you are going to need a popular site and a praiseworthy business. Go to each of these sites and get a measure of their social cred....  cartridgesave....  33,000 Google reviews... stinkyink... about 10,000 reviews.  Check twitter and FB for their brands. (I don't even live in the UK and I have heard of these businesses.) These are businesses that people are singing about.  People are typin' their domains into Google - asking for them by name - over and over again - every time they need a cartridge. Lots of people will disagree (especially hard core SEO linkbuilders). But I think that you will need a lot more than SEO to defeat them. I don't think that google is going to look at the links of a website and rank them above these guys without a huge human popularity factor.

ezine et al are much less effective nowadays. its all about going for articles on quality sites that aren't easy to get on. ANYONE can get an article on ezine and similar sites.

Pinterest is a nice SEO tool for sure. I've found that by listing new products and articles, you do gain new links from Pinterest while also capturing the attention of potential customers. It's a different audience than Google+ or Twitter, and a very active audience similar to that of Facebook. It seems to reach a slightly older crowd.

Great responce Shane, thank you for the information. Also it's not a few each week, it's each day that's why I'm trying to figure this out. I think i'll try to dominate my niche the wrong way and then go whitehat once i'm raking in the money. (We can all dream, but I don't see why I can't try this) Again thank you.

As above really.  Build links by offering your products to bloggers for product reviews, this is dependent on value of your products, relevant blogs will also drive traffic and sales too. You also want to make sure you can get most/all of your products in GoogleBase (shopping feed) to maximise your organic visibility, check our Google's Merchant Center.

Google will often display a different title tag in the SERPs than what you have selected. They do this even for Apple. In some cases it's so that it better matches the user's query, and in other cases it's because they think the title tag is spammy or not relevant. Are your ranks bouncing around in the SEOmoz ranking report tools as well? Those are generally good about keeping personalization out of the reports.