It's hard for me to believe that it is the BH making the noise but I have no experience with the BH you mention. I would sooner suspect the fletches. I'm assuming you didn't get the noise with your field point. Is it possible that your BH is lighter than your FT? If you are getting an increase in speed you could be getting a "fluttering" in your fletches at the higher speed. I've seen this when using the same fletch and going to a lighter arrow. If this is what is going on, the fix of course is probably a stiffer fletch. Just guessing...