Depends on how many arcseconds you want to dither. Probably 10 arcsecs is a good round number. Use that number to calculate dithering in pixels. In your case, it’s 1.55 pixels for guide camera or about 10 pixels for main camera. I would probably round up to maximum of 3 pixels for guide camera. My explanation is more of an example, not a requirement.
For mount settling, see:
https://wiki.starkeeper.it/index.php/Mount_Setup#Management
Peter