I agree with Aimee & have the same issues here with Chelsea atm. I'm loving my Itti Bitti Boos atm though. They are nice & trim but we haven't had a leak with them yet. Baby Beehinds Bamboo work well for us too
Kim's idea of a VBSN is a good one & worth trying if you don't mind spending the money
ETA - I also agree with Lindy. I actually get leaks when we use PUL covers now. At least with wool you might get some dampness on compression but won't actually get wet clothes. Definitely give it a try if you haven't already