I really like your exemption idea. I think there are several forms that people just generally do not enjoy because of some preconceived stigma about them or real life experience. Having been a person who has played many, I think you'd have to compensate your data much less using this method because more people would pick the one they really dislike rather than one that doesn't fit their build, or RP, etc. On the other hand, I can't count the number of times that I spun/rolled on one form just to get one of the others that I really don't like though (So maybe a double exemption?). Anyway, as much as I'd like to go into that, I don't want to hijack the thread.

As a separate suggestion, I think maybe doing a poll for each set of top tier forms for popularity may also give you a similar result.