I’ve had a .25 impact for years, competed with it at the PA cup and did quite well (for my first time scored a 220). I bought a conversion kit to .30 and I can’t get JSB 50.15, AEA 45’s or ZAN pellets to shoot for nothing. In .25 it would shoot a full magazine into a group at 65 yards all touching. I did get quite a bit of black grease out of the barrel when I cleaned it. I’ve tried tunes from 840fps - 900fps and it’s spraying pellets at 65 yards. 3” groups. Any general recommendations for the .30?