Since you have a Pro Formula and they are a twin cam, (I believe) I would check to see if the cams are in sync. The only times I have had persistent low tears with twin cam bows has been when the bottom cam has been advanced (ahead) compared to the upper cam. If I remember the Pro Formula correctly (never shot one but did draw a few) it does not have a real firm wall, so it would be harder to tell whether the cams were in sync than a bow with a firmer wall. If that is not the problem, then I would think you would have to keep raising the nock pt. as Rack Attack said. Brass nock sets can be a problem, I guess, but I am shooting them on two of my bows right now and both of them tune well. JMH0