I shoot a goldtip expedition hunter arrow that weights 8.2 gpi. The arrow is 27 inches long. My weight on the bow is 70# 29dl. If i switched from a 100 grain point to a 75 grain. would it make my 75 grain broadheads fly bad. I checked the foc of the 75 grain broadhead and got 8%. I will be shooting 4 in vanes. The arrows will only weigh 350 3/4 with the 75 grain. i was going to set my arrow with the 75 grains to get the max speed to just see what it is with the 350 grain arrow for target shoots and if it shoots good with the broadhead i did not want to have to move anything for hunting.