Your adsense id on all of those sites makes it easy for a human reviewer to see your sites. That is the downside to using Ad Cents........also if you use Google Webmaster tools, then that is another way to track you.
This sounds like 2005/6 all over again.
Ad Cents can be good income, but it is a double-edged sword. The tools that they give you, also can hurt you.
I have Ad Cents on ONE site. I am going to replace it with CPA.
And content IS KING now.
I looked at my site:domainwhatever.com and guess what shows up for that site? Articles and videos on the first page that I had done quite a while back......
So, the churn and burn method may work for a while, but in the end, many of those sites will be de-indexed.
I would try to give Google what it wants and realize that any micro niche site is and will be subject to human review. When that happens, well....you know the rest.
Sure add real original content and build links, that will help.
In the end, the micro niche sites are probably not worth the effort for long-term income.
I would go for the larger site concept, like basstrackerboats is doing.