Support had me try everything, including tightening that screw on the build platform as well as greasing the lead screw. All prints have a repeating wave of about 3-4 mm which looks to be what the lead (linear distant traveled for one full rotation) of the screw. Given I tried everything else and other printers like the photon and moai, which use more or less the same setup, have exhibited similar problems without a straight lead screw it doesn’t seem to be coincidence. The wave is there left right not front to back. Since the platform rides a rail it would be very hard to affect the front to back motion, but a bent lead screw could cause some axial twist to the bed left to right.
If others have a lead screw that isn’t straight and have no print problems I’d be quite interested to know.