To answer your fitment issue. I have an ATA and I'm 6ft also, ATA is slightly smaller than other armor makers (I mean maybe 3%). With your height you'll be fighting the fitment issue, there's not much you can do about it. That said, the waist belt will cover most gap issues with the kidney and butt plates, other than that just make sure all the straps are tight and you should be fine. I suggest you add the waist belt and post updated photos.