Jeff, if anything, my arrows were way overspine with broadheads less than 100 gns. Besides, I had established my baseline arrow flight/accuracy with all my test broadheads using the same arrows fletched with 4" feathers before refletching with the Blazers. I am convinced it was lack of stabilization on the larger heads.
I have to agree that it is a lack of stabelization with an airplane wing hanging on the front of your arrow requires a lot more area to spin a heavy wide wind grabbing slow tired arrow
