With a similar bow weight, but drawing to 28", I would typically use a 29" GT 3555 shaft with either a 100 grain or 125 grain tip, depending on the bow.
I would guess that the additional 150 grains up front would more than compensate for the inch less in draw length and the related effect on draw weight, so you would probably need a shorter arrow than I use. You'll need at least a 28" arrow shooting broadheads. It's possible that your setup may result in too weak of a shaft at that length, so you'll either have to go up to 5575's or reduce your point weight.
There should be no problem cutting GT's from either end. If it were me, I'd cut off 1/4" at a time, and not bother with 1/8", but if you think you're good enough to tell the difference and have the patience, then go ahead.