+1
Steffen beat me on that, all Centurion should really have that strap! One of the most important IMO.
Your back plate overlap a bit too much your kidney plate too, especially on your right side. Perhaps you could try to shorten a bit your shoulder strap on this side to bring the back plate up. I have AP too and we're almost the same size but my backplate doesn't overlap my kydney plate like that.
Also i don't think it would impact your Centurion application, but your back cover strips are a bit long, they should end before the bottom ridge:
Still it's very pleasant to see an AP, especially a very well assembled one like that
Good luck!