your strapping seems to need some tweaking
you should have straps connecting the cod and but plate, this will prevent the tail look and cod from protruding. also you need straps to keep the chest and back together. there are other small strapping malfunctions as well.
if you re adjust your back and chest the shoulder straps should stay attached with Velcro just fine, but you may need to heat and bend them slightly.
the armor looks great!
just a few strapping fixes and you should be good to go
perhaps someone in your garrison can assist you, it is hard to get it set up by yourself.