String silencers do work to dampen the twang of the string, but if you're right about what's causing your problem, I'm not sure they would help. As for where to put them, I usually put them about eight to ten inches from the tip, or from the point where the string touches the bow at brace height in your case since it's a recurve. I'm sure someone will be able to help you get it quieter. I hope I helped a little.