Several weeks ago I ordered a pack of plastic backed M4s and in the last week I finally got the opportunity to try them out, and so far I am very disappointed. I've tried them out a few times now and every time they end up leaking where they meet the thighs as I'm sitting down. They seem to sit pretty loosely against the skin on the backside. I expected so much more from these, and I can get a lot better performance from Tranquility, which is generally considered a lower quality diaper. Anyone else have this problem? Any tips that might help? I use a booster and plastic pants.