I'm no expert at all. This is my first year growing peppers as well. But, I thought I might be able to help. There was a link someone posted on here about growing peppers, I can't remember which thread though. Maybe you could have a look through. It was very informative. It did have something on there about wrinkled leaves though. There was a picture of pepper leaves just starting to sort of pucker and it said that it was crying out for bonemeal. Have you used bonemeal on these plants at all? After reading that I had transferred some of my peppers, but left 3 of them for a while to comare what the difference was. I added bonemeal to the peppers I moved, and didn't to the others. After about a week the ones I haden't moved did start to pucker a bit. I have since moved those ones and added bonemeal, and they've straightend out again.
Hope this helps.