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This sounds similar to the Vixen GPDX worm adjustment.
There are x2 M6 socket head cap screws (pull-in) that clamp the worm housing to the mount and a small grub screw (push-out) in between them. By very slightly tightening the x2 M6 socket head cap screws the worm mesh increases and then by tightening the small grub screw the action pushes the worm housing slightly away from the assembly to ensure the fit is not too tight.
There is also a large hex nut at the end of the worm shaft which can be adjusted to remove any excess end float in the worm shaft.
As you rightly say, small iterative adjustments are the key. I adjust mine so that I can still grab the short worm shaft and turn it manually with my fingers. If I am not able to turn the shaft using finger strength, I judge the mesh to be too tight and the MT2 motors will labour on the GPDX.
Cheers
Dennis
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