Dobly, that really sucks. You probably wrote about this elsewhere, but did you let them know? I've found they've been very apologetic and helpful and quick to respond if there was any concern about their products. But definitely a major bummer to have all the 12's give you so much grief.
c whitley, I also found my kick drum extra bouncy with the mesh conversion (and especially when I tried putting a 10 or a 12" pad on the stand instead of the 8!) I tried loosening the head, also tried dropping the mallet a bit so it's lower where it hits.. finally, I've stuck on Evans head protectors and they took a bit of the bounce off as well. Maybe you have to adjust your pedal springs a bit as well to compensate..I'd think a bit looser perhaps, but that may also affect the feel and speed but seems it's a constant series of trial and error to get all the components to work for you as you like (and even then there'll still be something that's just not doing what it should do..hahaha)