R the B'Head groups tight or loose? Impact point don't matter as u can always sight in. If they're tight just sight in, if they're lose then there is more work to do. Spin test and see if any have any wobble, if it does take thar B'Head off and try on every B;Head u have until it spins right. Do u use the o rings, they really help with that. If u r using fixed blades that r over 1 1/4" wide it is wind planing. Then u need to get smaller B'Heads!