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BB's curving in random directions sound like inconsistency with your bucking, barrel, or bb's. If the bb is not spinning along the correct axis, it will fly left or right. That's why I asked if you got oil on your hop-up or barrel by accident. It's also possible that the bucking you put in was damaged or maybe there's dirt or residue in your barrel. All that can cause an inconsistent or incorrect direction of spin which could explain you inaccuracy.
What brand bb? Changing the weight could mean different manufacturing process; therefore, quality. Double check the bucking and barrel to make sure they are not damaged or dirty.
Is your FPS consistent? That could change the range of the bb, which might look like the bb is curving down or dropping prematurely. Is your nozzle making a tight seal? Do the flashlight test. I know you are getting good fps, but an inconsistent fps could mean air leak.
As for bucking, I personally like the Madbull Red with the fish bone spacer. Good air seal and the spacer centers your bb.
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