Your ratios might be worse, but what about average signups per day?
It could be that rehab didn't show unique hits, or didn't show all hits in the stats, so the ratio's looked better. In the end it's all about how much you make a month. If that's the same or better, the ratios displayed in the stats don't matter much.
There shouldn't be that much difference, as you say the sites (and celebs) are almost identical. I send to several celeb programs and ratios are pretty much the same on all.
Try sending to
http://www.gossipkings.com/ their ratios have improved a lot lately for me.