I think, for clay targets, if your components can give you a load that is in the 1100 to under 1150fps range, you will feel the difference. Before you do anything else, maybe try your current bushing again, and confirm on your scale, that it will drop the heavier powder charge, while you cycle the press as if you're loading. There should be multiple pulls on the handle with various functions for every drop.
If you can recreate and confirm the heavier drop, then go lighter. There were ideas earlier about how to reduce the inner diameter of your bushing, I prefer the tape idea figuring if it ever comes lose it should be easy to tell that sometime isn't right. Maybe, you can figure this out before you purchase anything else.
If you come up with something you like, maybe you can use up the heavier loads a box or two at a time in the beginning of a session before the recoil gets to you. If your cheek is okay with the recoil, maybe some pad on the gun or your shooting shirt would, not just for the heavies, make your lighter loads more enjoyable for your situation. Best of luck with it.
