A holster like the Milt Sparks Versa Max II does a great job of distributing the weight of a revolver. Maybe a different belt would help too?

I know you like your 686 but there are other carry revolvers with a similar feel that might be easier, maybe a 66, or a NightGuard 386 if you can find one.

Not a fan of chiropractors (or anyone using the title "Dr." without having attended medical school) but that's a whole nother topic...