Realistically, I wouldn’t worry about it. If you were doing thicker aluminum, there may be merit to dialing it in a little to get a better wall finish. For wood, I don’t think you’d see a difference.
Regarding table wobble, you can probably reduce that by adding some diagonal braces from front-to-back, to reduce the tendency for the table top and legs to “parallelogram” with the gantry moving. I would probably do this (and we have done this in the past).