I have a network of 200 sites, and they dont seem to be performing very well in Google. I am tracking the rankings, and only about 10 - 15 of them shows up on the first 100 pages of serps in Google. It is a network of Wordpress blogs, with a list of links to all other blogs, which is placed in an iframe in sidebar.php, and blocked by robots.txt, so theoreticaly that does not get indexed etc. We add quite a lot of two sentence posts with a picture to the blogs also. There dont seem too be a fresh content boost in rankings or anything like that. It just seems like the websites would be "dead" in the eyes of Google, and they just dont perform very well.
Sitemaps are added to Google Webmaster tools, we use Yoast SEO plugin, categories are based on keyword research, we try to avoid keyword stuffing, and everything with on site seo is ok. The websites are about 6 months old, and receive about 4,000 of traffic (across all 200 sites) a day. Something just aint right with this, I think, and I am not sure what's going on.
Is there any way to check whats going on?