I think you're about right. Might even be able to shoot 5# lighter. Don is also right. Even if that is a little heavy, most bows will shoot overspined woodies quite well. It's the underspined stuff that won't fly straight. In that weight, you're likely going to have to go with 23/64 rather than 11/32 shafts. The larger diameter shafts have the same effect as building out the side plate a little to weaken the shaft. Might see if the folks at Surewood can supply you with a test kit of three shafts, one at 75-80, another at 80-85 and another at 90-95. Good luck.