Did same to a 200 but using Altaros reg. Got similar results to you too but with the odd very high power shot. Had weeks of trying to balance it by adjusting reg, hammer spring tension and power adjusting screw. Have you had the hammer and spring out and cleamed it and removed any roughness, makes a difference to consistency. Had enough after many stripdowns and sold it (was better but still not sorted) being left dissallusioned with regs and pcp's and went back to springers.