Just a thought, is your suspension working for you? A fork that requires a big hit before it starts working might/will cause more strain than something in good working order.
Aside from that
I don’t know what you’re riding. Modern geometry full suspension? A Diamondback Ascent from 1992? It’s a world of difference.
I simply couldn’t ride an old bike with new bars, even with a short stem. Those monsters performed best with a long stem and 600-650mm bars. Same is true for a modern long and slack ride with 725-800mm bars.
If you’re shoving a round peg in a square hole and wondering what the problem is, well, there you are.
Another thought. How are your wrists? Ever broken them, had repetitive strain, just started doing a bunch of floor push-ups, need carpal tunnel surgery? Are your hands weak for your size? Or strong? All this matters. The best fit in the world can’t fix an underlying health problem. Something to think about.