It's the quality of the stand as much as that of the 'scope. It has to be rock steady if you are to get images that aren't blurred. A heavy chemistry lab stand and flask clamp are as good as anything, and better than the flimsy stands that generally come with cheap microscopes. I bought the Dino-Lite stand, but even that isn't what I'd like to see.
At the end of it all, I went back to fine-tuning VTA by ear. What does it matter if I get an exact SRA of 92.5° if it sounds better at some other position?