Im giving you a general figure assuming a thing or two you left out. But with 8.1 gpi and I "assumed" a 29 inch draw shooting a 29 inch arrow with 3 4inch vanes and at 70 pounds. I have calculated it to be 5.24grains per pound. IBO's lowest limit is 5.0 grains per pound. This should make you ok but leaning already towards the light side. Hope this helps some. Good Luck.
Whitey