You have a bunch of web sites with the same poor-quality layout that are dominated by ads, that's pretty much the definition of a spam ring, and I don't see why it's so surprising that google would want to limit clickthroughs to your sites.

I'd say the best way to improve you're score would be to get a good design that looks legitimate, and content-focused, and try to vary the designs of your other sites to look more like you are actually providing something other than the same ad links people were looking at when they clicked through to your site.