as I said, the ring gear moves after locking the axis for some reason. This causes the mesh between the worm and ring gear to be too tight on one side and too loose 180 degrees on the opposite side.
So I had to push the worm block slightly lower by the shims to get even mesh tightness around the ring. Strange, but it's working now as it should be.
Mounts: ES EXOS-2 PMC-Eight, SW AZ GOTO
Scopes: SW 200P, SW 130P
Cameras: Canon T3i, Canon XS, SV305 Pro - IMX290