I’m on a width sweep finding journey for my Mtb’s. Currently at 740 at 9 degree sweep w/50 or 60mm stem, depending on the bike. I’m pretty small at 5’5”. Im on 42c bars & a 70mm stem on my gravel bike & holy cow do those feel small!
I’ve run width as narrow as 600 something with sweep from as much as 24 degrees to 8, I think. Most of the past few years has been spent with SQlab 12 degree sweep bars at 720mm. I found myself getting horrible pain in the heel of my right hand with those bars. It didn’t start out that way but something in my physiology has changed, I guess. I’m currently very happy with the 740/9 I’m on now. I always ride with my hands at the far ends of the grips. There is some term I can’t think of right now (maybe cognitive extension?) that says if my hands are at the ends of the bars, I’m much less likely to clip a tree with them & it’s true enough. I ride in some very tight trees and rarely have a problem.