Need some Prod tuning help.

I've heavily upgraded my Prod - possibly more than needed - and I need some help getting a good tune.

  • Huma regulator
  • Hill Matched Parts kit (valve, hammer spring, transfer port, hammer)
  • LW chocked barrel from JSAR

Currently the reg is set to 130 bar, not sure what the hammer spring settings are, but it's set to 19 fpe (~740 fps) with JSB 15.89 pellets. I'm only getting about 8-9 shots before I go off reg. I've tried dropping the regulator down to the 90-100 bar range and had trouble getting the power I was looking for. 

I see threads with people claiming tunes in the same power range and getting 20-25 good shots. I was never able to get that many shots ootb before any tuning other than the hammer spring and hammer throw settings. Not sure what I am missing but could use some suggestions to get some more shots out of it.