I have the same problem. Unfortunately (in my opinion) being anything above 6', as i am 6'2", seems to have a bit of a toll on how much the kidney/back will cover and there isn't much to do about it unless you got a larger piece from another seller who makes them on the larger size.
As a millenial, who was introduced to star wars through the prequels at first, my favorite scene and what i consider to be the epitome of wars far far away has to be the clone invasion on geonosis, episode II
There actually IS an approval for this armor, not sure if you posted in unapproved by accident or not, but theres an entire forum for spec ops armor like shadow troopers and they are 501st approvable. Look into it! I got an anovos shadow as well and i'm still working on it