what lenght will your finished arrows be? i would think you could go to a 100 grain tip and still be ok,but check with the charts then shoot a couple of the recomended shafts and select the one your bow shoots the best,it may not be the one you think you should shoot,my point is let the bow decide which arrow it likes the best.sometimes people tend to get stuck on a paticular arrow without even seeing how well it will perform out of the bow.