Arthur, In this case, if you were using the same arrow shaft, could it have been a spine problem?
I don't know how well the Blazers work or don't but I wonder if this was an issue with the vanes lacking control because they don't offer enough stabilization, or they lacked control because spine was too weak with the heavier tips..
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.