Thanks for the feedback Dan, and the complements.
All very helpful - and things I wondered about when building. I can fix these all pretty easily.
The easiest will be the dropboxes, as they are removable. It's ATA armor, so the boxes have both the front and full-closing rear. I didn't glue them together, but did glue the elastic to each side. They use velcro to hold the two sides together. Simply need to adjust the length of the straps.
The cover strip won't be too bad either. Looks like the gap between the halves is filled as well? Simple fix. I will add that to the list.
You're correct on the ab buttons as well. I can clip the sides back a bit and be good.
I just finished reading the links posted above, and it looks like a few other minor tweaks and I should be able to hit Centurion!