That’s really important! 
It’s offset 1mm. 2mm max if you spin both rings 180º.
I was going to add a 0 offset one like that with the geared ring up top, but I didn’t test that one as much. It allows like 6º of adjustment, and I wasn’t sure I wanted to tempt someone to try to account for a build that is that far off with the rings lol.
The one that’s there allows like 1-1.5º of adjustment. Outside of that, it seems like maybe something else needs to be fixed.
I like the idea for fine tuning flatness, but not hiding defects.
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sorry to sound dumb, but what grub screws are we referring to? the ones on the leadscrew couplers?
Yes, as a possibility, but also on the stepper shafts/pulleys. Basically any of them. If thread locker is used, probably not an issue. But if concerned about a particular axis, grub screws related should be verified.
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