great image there sharp stars.
With the mount, it may just need a good degreasing and re lubricating. Ive pulled my Sampson mount apart and fully degreased and cleaned the bearings and relubed it (with a mix of oil and grease not just grease to lower friction) It moves so smoothly now. In fact I mixed some friction modified additive with the oil about 50-50, then smeared plenty of that along with some grease, in the needle roller RA bearings and dec sleeve bearing. I flushed out the dec motor gearbox and filled it with a mix of oil and grease, it runs very quietly