I have a 50# Savannah and the recommended brace height is 6 1/4 to 7". I started at 6 1/4 brace and moved up to 7 1/8". I took off the string silencers I had on and shot some 1916 aluminums.
at 61/4 th bow was noisey and vibarated at 6.5 to 7 1/8 I dont hear much difference so I started jut trying to feel the vibration and time it vibrated, is there a way to make this more noticable so it is easier to find the sweet spot, the bow never stops making a twanging I just dont see/hear/feel much difference from 6.5 to 7 1/8.

Terry

Most bows will shoot OK at a range of brace heights.  Generally, you'll want to set it the lowest you can and still get good arrow flight.  If yours shoots good at 6 1/2 to 7 1/8, set it at 6 1/2.  The lower brace height gets a little more performance out of the bow.

I always had my Savannah set at 7-1/4"and string silencers set at 14" from the limb tips,that bow was very quiet and buzz free.I have had buzzing problems with poorly made strings though.I like a 12 strand D-97 string with .024" Halo serving.
Don

I think my Savannah is kind of noisy.  I originally used some beaver fur silencers and they didn't seem to help it much, so I switched to some yarn puff silencers and they seem to quiet it down enough.  I am guessing some bows are just more prone to noise.    Without the silencers it was too noisy for me.  I haven't experimented with different strings, so there may be some quieter than others, I don't know.

Ron

Terry 1916 are a light arrow a 2016 might help.

I would change arrows like Ray suggested 2016 or even 2018.