Clint, it's looking really good. I can see difference between 19" and 21". You are definitively not "chasing a tiller" on this bow. You're just tweaking it to perfection. Did you narrow the tips or thin them?
You're the one who can see and feel the bow. Follow your gut and your knowledge. I (we) are just armchair quarterbacks. So here's my armchair quarterback suggestion. The right limb just past the pin knot is bending more than the knot is. I wouldn't touch that area for a bit. If you can get the pin knot area to bend a bit that would be great. All in all if you can get the outer limbs to bend as much more as you did between 19" and 21' by the time you get to 23" you're probably perfect by my eyes. And you'll still have an inch or two to play with.
At this point I would probably be tillering it in my hand with photo support or a mirror more than I would be on the tree. It takes longer to do, but for me it has help.