You could get yourself some 1/4" Teflon rod and make some TP's of various sizes? Velocity will drop a bit (how much will depend on how small you make TP) but your string should flatten out, gaining a few shots in the process.Wouldn't mind improving on those strings though. It doesn't sound like it's hammer bouncing. Thoughts, comments, anyone?
SeanMP posted a good thread on TP sizes for his '78. His is .177 mind you, but the principal is the same: http://www.canadianairguns.com/showt...of-a-QB-on-HPA
Hopefully Sean or Bob will chime in with a more accurate analysis than mine for you!
Todd