Lee,
I'm sure some folks will be able to give you some good starting places for you particulat bow, but it's going to help them if you give them the specific bow (degree of center shot is a factor) and its draw-weight at your draw. Do you draw 28" or normally use a 28" overall shaft length?
No problem using GT's, but to get arrow mass that low you'll have to stay with the Lites; as low a gr./inch version as you can. They work. I've used them for some test arrows, and have used them in setups for some folks.
Ed
TGMM Family of the Bow