Everyone talks about 'anchor' points. Be it a tooth, corner of the mouth, cheekbone, whatever, it's always referred to as the 'Anchor'
I'd like to mention here something that my old archery coach taught me a few years ago.
"If you think of it as an anchor, that's what it becomes. It'll stop you dead in your tracks."
Instead, if you think of it as a 'reference point' you won't stop there. Ideally we should be looking to reach our 'reference' just as we run out of muscle & need to start correctly applying back tension. If we come to our reference & then expand into the shot/release/follow through sequence of the shot, you'll notice that;
a) the drawlength will inrease slightly
b) the release will be cleaner & smoother
c) the follow through will be straight back
& d) the drawing hand doesn't ever actually stop.
If you watch Terry's videos of him shooting, you'll notice that he never actually stops his draw. He comes up to his refernce & continues to expand until full draw is reached & thenreleases the arrow in one fluid motion. David Sosza demonstrates this very clearly in Masters of the Barebow (Either Vol 1 or 2, I forget which)
If you watch Rod Jenkins shoot, he comes to his reference & then mometarily stops to adjust his gap. He doesn't then just release the string, he continues to expand through the shot.
This final expansion need not be a long haul back, it need only be a fraction of an inch, but the point is, it is a continuation of the draw, after your reference has been reached.
Just an observation.