[lurkingknight]

does the slice get better or worse when you adjust hop? If it's being affected by hopup adjustment, then the barrel and hopup bucking are out of alignment. It could still be they are out of alignment even without adjusting hop but just slightly. Straight off or does it curve increasingly? If its actually arcing, your hopup rubber is probably to blame... it's not aligned properly.

Did you swab the barrel out with some clean cloth and the unjamming rod? I have a pistol that shoots off center when the inner barrel is dirty.

Also check if your sights are not out of adjustment in windage... Maybe the rear sight got tweaked and The gun is shooting straight, and you are just aiming left.

If it's a really consistent vector off to the right it should be easier to find lol.