Looking at your suit, I can clearly see that the flight suit is a bit too big for you, especially at the arms and legs. The vest is big and long too, this is why you lowered the armor (which doesn't look too accurate: is too flat and wide - who is the maker?). The ideal placement of the chest/abdominal plates is closer to the collar, but I think your collar plate isn't permanently fixed in the image, this is why it stays higher on your shoulders.
My advice is this: if you bought the flight suit/vest from bobamaker, but you (or him) had give the wrong measurements, you could contact him for a resize on both cloth parts, then (if you succeed) you can try a new armor test fit.
I hope I didn't sound too harsh.