Here I've managed to show the red spot, but I don't get any of the turbulence you can see on other pics. I've used a 3x Barlow, 200mm Newtonian and DSLR + stacking.
I've seen better photos with a 127 Mak (so it's not aperture), better photos with a ZWO ASI120MC, which is not a high resolution camera, better resolution with a 2x Barlow, so it's not magnification. I can only assume it focusing. I have a basic Celestron focuser, so I'm going to try to fix the wobble with PTFE shims/lining. I'd really like a Crayford two speed, but it more than the scope. I might as well upgrade the whole rig.