Yes, I do feel some additional notes could be added to the Centurion specs on how the knee belt should be installed and sniper knee plate trimmed (not an issue in your case, but I see it too often in builds), being part of what I consider correct assembly.
Technically you should be approved because you have all the boxes checked, but I think both you and me would be happier knowing that no visible flaws can be found.
If you disagree with me, don't mind saying so. This needs to be a transparent process, and through community discussions it may lead to improvements to what level of detail should be in the specifications.
If you do choose to get a replacement knee belt and do the mod, just post it up and we'll take it from there.
In the meantime, be proud of a near flawless armour. You make your garrison proud.