For the 1st time in my life I ordered and just got 12 new Easton arrows, 500's, 32" long. I shoot 30", I tried one with a 100 gr point, in my 2 Herters bows and it shot perfectly in both bows, one 37# the other 45#. Should I cut them to 30" or let them at 32". I don't want to mess up the spine because they shoot good the way they are. I'm new at this and don't want to screw up $80.00 worth of arrows.