Klaus, you are the aeorodynaimist, you should be telling us <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

In my opinion the sail should stall over the whole at the same time when you have perfect trim. If your uni-rig stalls over the boom first, I would say you should try less twist. But, that would depend on conditions. In chop you probably want more twist. That is my opinion..