I shot the razors out of my compound and found they where loud,, Dick I think I still have some just for you if you want to give this a try on one of those huge 23/64 flying telephone poles you hill guys use.
if your bow bareshafts these perfect and it should be close with 200-250gr points you can use even 3/4 feathers if you want,,, if your getting a swing effect on the shot it will do the same thing to a certain point with the smaller fletch. also rule of thumb is the broadheads shouldn't be bigger than the fletch if your not sure about spine,,, another thing is if you don't already do this you need to take a broadhead file and file the inside of those arrow nocks so they do snap on (or stay on) and stay while the arrow is hanging and then when you lift the bow quick they come off--> critical to bareshaft tuning I think.
if these fly good I'd love to see how a 2" wide treeshark or somethingn similer will fly out of it.
as for broadhead vs fletch size I have a bow here that bareshafts perfect out to 30yds my max BS distance. I put a Treeshark on that arrow that spun perfect and it hit right on at 20yds. my other bows that BS good always have a little sway with the big heads but this time its dead on OR I see no kick or drifting so itt can be done.