Try spinning the head on a bare shaft in a 1/2 drill. Use a slow speed. An arrow only spins about once every ten feet. Next put a field point on the arrow that held a heavy head and spin it. Try an arrow you heard in the drill. Put talc or powder on the shelf and windows to see if anything is hitting. The heavier head may have change your setup. When using the drill hold the shaft in a cotton rag to control the spin.
It's not a tuning issue as a result of arrow slapping or anything. The heads are not heavier than my field tips (?). I mentioned 2 weights of heads explaining that my smaller diameter snuffers don't hiss out of any bow, but the larger diameter ones make a horrible hissing noise (from any bow, any arrow). The vents on these larger heads hiss loudly all the way to the target. I know they've put a lot of meat on the ground over the years for people and the size really appeals to me. But if I can't figure out how to quiet them, they are of no use to me.
I will try to file down the backs of he vents and see if that works as suggested. Every broadhead arrow I shoot out of any of my bows in spun true during the tuning process. This is an in-flight noise, not point of release or tuning noise.
I bareshaft all my set ups, so they are as tuned as I can get them. It's a noise manufactured by the broadhead - extreme hissing. If you've ever shot one of the big Snuffers - I would have to assume you've heard it.
Thanks for the replies so far - I'll try filing one down in the vents to see if that helps.