I have an american defense quick release mount on my AR-10. I have taken the mount on and off a few time and the point of impact shift is minimal at worst. I always put it back in the same place so I can't speak to moving if fore and aft. It does have 20 MOA of cant built into it. I have been happy with that setup. I think you will have better luck with a mount where as you note the whole mount moves rather than loosing a set of rings and sliding the scope back and forth.
From summer shooting to all bulked up for winter, on my hunting rifles I do not move my scope, (Personal preference) I just try and get my head in the same spot every time.