I'd start with full length, about 30.25 with standard inserts and 125 grain points and start playing from there. When you are tuning, never cut more than a 1/4" at a time. Stone Knife up above may be close as well. But I'd start long, with several point weights and start playing. They shoot well and are durable once you get it right.
If you ever want to go heavier, my recipe for 670 gr gold tips out of a bow at about 50 @ almost 29" works well - but you'll need 5575 GT's. Cheers.