From all of the above posts you are pointed in the right direction. My biggest impact on noise has been arrow wieght. You are on the edge of being too light for your draw weight that you could cause damage to your bow. The point where I see the most noise reduction is around 11 grains per pound of draw weight, that puts you at 693 total. There are lots of options to get where you need for arrow weight. Let me know if you want more advise on this.
The second piece of advice is that the spine calculator on 3rivers website does not work for me. I have a long draw length too at 31", and have talked to a few people with longer draws that say it does not work for them either. I shoot MFX 340s out of my 66lb longbow, but that is with 250 grain point weight. I can shoot the MFX 400s with 125 grain points, but they are a lot more noisy because they are lighter.
I have also found that by using one silencer at the 1/3 point of the total string length from the bottom and the 1/4 point from the top gets a lot of the harmonic hum out of the string.
Final thought is that a 60" recurve may be on the short side for your long draw length and that may be causing some noise issues as you could be overstressing the limbs at full draw.
I hope some of this may help. -Clayton
I've recently been able to switch to Easton aluminum arrows, Game Getter II's 2319 and they are FAR quieter than my carbons were, and fly much much better.
And sadly you are right, the bow is short for my draw,
but it's all I have,
Husky Hillbilly
