Copterdrvr, as this is my first PCC no I haven’t tried lighter springs yet. It seems counterintuitive though that a lighter spring would reduce the recoil impulse. I don’t think the Tubbs AR10 spring is harder. Having installed it recently I found the charging effort nearly equal to the orange Springco. It did feel like a smoother action. I’ll see at my next range visit how it affects the recoil impulse during shooting. I’ll check out the blowback 9’s site too.