Back Pain?

Carrying a shield plus AIWB in a TREX ARMS sidecar with a Nexbelt supreme appendix and DCC clips. I noticed that I print a bit when I ride the gun high but lowering my pants to where I’d normally wear them it virtually disappears. However with this I noticed that I need to crank my belt super tight and it’s causing me back pain. Do I just need a stiffer belt? If so what’s recommended? I’ve heard good things about the blue alpha gear hybrid belt, just not sure if that’s stiff enough. (5’9” 145 for size perspective) via /r/CCW https://ift.tt/8OGba26