DeerT, Beman' s chart suggests a 500 arrow at 55-60#, 27" long. A 400 is suggested at 60-65#. I don' t think you are over spined. What gives you that impression? Try a 125 point & see if anything (other than point of impact) changes. Do you start hitting left or right. Are your groups opening up as you move back? By that I mean starting to get flyers.

The BowTech bows, in particular the dual cams, do like a stiffer arrow than the charts suggest. I think this is due to the aggressive cams. When a 60# BowTech is shooting 320 fps, and a similarly speced bow from another manufacturer is shooting 290, the BowTech is obviously imparting more energy into the arrow. For this reason, a stiffer arrow is needed with the BowTech. The single cams are not as in need of the stiff arrow, but do to a degree need one.