Generally, you'll shoot too far to the right with a weak spine, and too far left with a stiff spine when shooting BH's as compared with FP's for a RH shooter and even with attempts to tune, the trend will stay the same. That being said, I did get a BT Tomkat 2005 model to BH tune with the same arrows I shoot out of my 70# bows, it just took a little very fine tuning.

Check out this link, page 11..... http://www.mnarchery.org/EastonBowTuningGuide.pdf