YPN and AdSense are not much different

I'm getting good relevance with YPN. CTR is a bit lower, but not much. There are a pretty decent # of advertisers in my niches and my sites are very well-defined, however. I'm happy

 

Maybe this is obvious, but what about replacing Adsense with YPN on pages with low CTR? I just got my YPN and am anxious to try, but hoping for some guidance by the pros who have been running both.

My main site has very high CTR on some pages and very low on others. Mostly the same Adsense ads appearing on most pages. Other pages it doesn't seem to matter what I do I can't shake the PSAs, so those seem obvious YPN candidates.