I recently switched to helical from a slight offset on a Vapor Blackhawk 4000 arrowand the reason beingI shoot an 85 Grain NAP Thunderhead (fixed broadhead). From my understanding itwill give a better flight. Well I went to shoot them with just field tips and first had to adjust my sights as best as i could because none of them would hit in the same spot?? If they fly like this with field tips then i am afraid what the results will be with the broadhead.

When I shot with the slight offset i could group arrows great especially with field tips. I have a drop away rest and there are no signs on the veins of interference with it. I made sure all the knocks are seated properly. I can not see a reason to spin test, especiallywith field tips. Any suggestions, tips, or information on a helical vein that would cause this? is this normal? any help is TOTALLY appreciated Thanks