super-hunt there are a couple flaws in your logic. It can be a spine issue that is magnified by the BHs. As I previously posted, I had the same problem. Second, there is no evidence that 'tuning' BHs to fletching improves flight. It is a myth. If your bow is tuned to properly spined arrows and your BHs are aligned (ala spin check) you will not have a flight problem - period. I shot various 2 blade BHs with excellent results including Bloodrunners.
I would bet that if this guy went up to the next stiffer arrow, did a bit of tweaking, his bow would shoot better than he can hold.