He'll have 11lb factory hammer springs shortly I think.
I use an 11lb factory spring in my match gun. Still using the same ones I got in 2011 in Greece, just keep swapping them across guns. For my practice guns I run the 11.5lb Cajun springs (yes they are available from me). For recoil I run factory 11lb recoil springs. But will be testing some factory 8lb ones as well. If they work okay I'll bring in a bunch. I will admit I have had some issues with the 11.5lb hammer springs lately, and that's with reduced firing pin spring and extended firing pin. same ammo worked fine in a Shadow with regular firing pin. Going to do some checking of primer depths and such and see if it was a fluke.