If the Bush worked ok I would suspect Simmons, not mounts. We quit selling Simmons many years ago due to quality problems.

If it is mounts, I assume they are the type that mount on a rail(Weaver Style), not the windage adjustable(Redfield Type). If this is correct you might tryturning on of the mounts 180 deg. If this works or takes it too far the other way, you probably have a bent mount.

I am not a fan of see-thru mounts, not stable, so high they bend easy.