I would look at a different spine. Somewhere around .360 maybe weaker. I shoot a .300 spine arrow with 300 grains on the front at 66# from an Allegiance. Those are also 30 inch shafts. You don't say how long your shafts are but if they are close to your DL then they are likely way too stiff.

EDIT: I also have a .400 spine, 29",arrow with bushings, 50 grain inserts and 100 grain points and shoot that out of 60# Allegiance.