this is my experience on astrophotography, balance to center is very important, this is what i did, especially for s50 users, use L-bracket to make the machine close to the center of gravity. i like to tune the polar alignment to 0.0 / 0.0, so wedge is also needed.

the metal ring (around 1mm thickness, mine is 10x30x1.5) on the back is needed, i dont know it's my s30 pro or design problem, the plate attached to the bottom will easy collision the outer white plastic area(mostly backlash problem), that's why the tracking sometimes got startrail, hope this can help everyone to improve the tracking accuracy

tips about s30 Pro balancing