I would venture to say that the 250's are going to be a bit stiff for your setup without adding an awful lot of weight up front. I just got done building a set of arrows for a friend, and the 150's with a 50 grain brass insert and 125 grain tips flew pretty well cut at 29". The nock collars shouldn't hurt much, but I think you're going to be chasing your tail with a shaft in that range. Like everyone else said though, try a few shots bareshaft. That will tell you more than any of us can without seeing your setup.