I recently just ordered a dozen Carbon Xpress Herritage 150 shafts . They are fletched with 5" shield cut feathers with arrow wraps and have their regular inserts installed. They are cut at 28.5 " . I shoot a black widow pch recurve at 54# at 28" . Based on these facts , can anyone help me on the proper amount of grain head i should shoot to obtain the best arrow flight ?