Welcome to the Q&A Forum

1. Why do you even want to boost it for? It counts for NOTHING. Its not used by the search engines at all.

2. Alexa rankings are based on visitors to your site by those with the alexa tool bar installed.

3. To increase it, just install the tool bar (and get a few buddy's to do it as well) and click on your site a few times each day.

Think about it this way: If DA and PA had anything to do with traffic, how do you think Moz knows what traffic a site is getting in order to factor that in the DA ad PA calculations?

They are based on link metrics.

Correlation does not imply causation.

Agreed, Google tend to change them when the algorithm perceives that the title of the page is not useful to the searcher. This usually happens when the title is spammy or keyword stuffed. Google is trying to better serve the searcher and not the webmaster by doing this. You need to experiment/split test the title.

This may be a bit harsh, but in all honestly I would be unhappy at getting these sites in my search results if I was searching for info on the products.They are nothing more than useless thin affiliate sites that offer no value to the web. You may say that they are not thin affiliates,but they are.

Have you been removing the spam article marketing links to the site? I can see a number of links that no longer exist.

Look up the 90 9 1 principle (ignore the debates about the actual numbers, its the philosophy that counts)

Try this as starters:

The 90-9-1 Principle Applied to Forums

It will be listed under Manual Penalties in your Webmaster Console.

You need to change it to something less keyword stuffed and less spammy looking that you are happy with and see how Google handles it. Experiment.

BTW, you and I may not think your title is keyword stuffed or spammy, but that does not matter - what matters is the algorithm is interpreting it as that, so you need to change it to get the title in the search results that is better than what Google is deciding for you.