I'd lose the suspenders and the straps connecting chest and back,
connect the kidney to the back and the chest to the ab plate,
connect with rivets the kidney and ab on the left and with velcro on the right.
(Or you can do as I did: I have integrated the belt/suspenders/thigh_straps and connect the chest to the suspenders, works like a charm.
In this way the chest is well pressed against the body, but can overlap the ab plate freely giving me easier movement.)
In other words, the accurate way You undo the crotch and the right shoulder straps, open the armor like a clamshell and get in, close the side/crotch/shoulder.
I'm 5'8" too, and to perfectly fit in my TM I had to heat and bend down the strap parts on the back piece to "lift" everything up, it worked