I'm no software guy, but cut that short, at your draw length- I'd say you'd be fine all the way to 70-71 pounds or so.

On the GT500 I had 28.5"" draw, 62 pounds, shafts cut to 27.75"- blazers, 100 gr pt and a heavier than normal insert (Beman ICSH) I was a teeny bit overspined with a ICSH400.