Good job working with your anchor. In my first introductory archery class, I emphasize only two things: the magic T and anchor. Moving the anchor 1/8” on your face will make a 6” difference in POI at 20 yards. You want your anchor to be tight enough on your face to be repeatable, but not so tight that it is difficult to get a consistent release.
I shoot 3 under, and my anchor is my index finger under my cheekbone. It's a two step process: first I put my index finger under my cheekbone, and next I press up slightly with my index finger against the bottom of my cheekbone. I like it because it is quick and easily repeatable. I'm not suggesting that you adopt my anchor, but find some anchor that isn't going to move on you.
A good check on your form in general is whether your string hand recoils straight back after the shot and your fingers end up touching your neck or shoulder. A slight recoil of only an inch or so is okay too, where your fingers stay on your face, as long as there is some recoil backwards, and your hand doesn't move sideways, or worst of all forward, when you release the shot. If your hand ends up in the air to the side of your face after you shoot, this indicates a form problem that you need to fix before you move on to anything else. Could be a lot of things, but likely candidates include overuse of the biceps, failure to maintain back tension through followthrough, or failure to complete the draw so the string elbow is all the way behind the arrow.
All of these things apply to any style of archery that exists under our western tradition of shooting.