Okay, 55 at 28" with a 30" arrow and shelf cut 1/4" past center and a 125 grain tip. I suggest an arrow spined in the 65/70# range. But with the arrow cut to 30 and the shelf cut past center you may need 70/75# spined arrows. XX78 2314's. Is there a bow shop close to you where you can shoot different spined arrows? That would be the best bet.