I have only 730mm and I really like it, I had something like 630 before and that was really too narrow, I'm around 6' tall and have bit of shoulders too.
Also I'm using short stem, 40mm I believe it was, this is with 19.5" frame 26er HT and I have saddle set up as front as I could make it go, saddle nose is tilted bit upwards too, really weird setup I believe, but works really well when descending and enough well when climbing.
I guess my setup is quite cramped, I don't like stretched so much as I like to move around quite a bit and when descending I like to go behind the seat at times, it is easier with this setup than with a long stem.
Only problem I have is clipping on small trees/bushes as I have Procraft bar ends, several times I have found bar ends clip on something and I get to test my reflexes and strength. Sometimes trees are just too nearby and can't make it past them.
On trails bar ends are not much of fun really, so might remove those and see if it gets better.
Might try wider bars, but even my current one is quite wide for where I ride, there is small trees everywhere and going around rocks, soft spots on swamp etc. is bit hard at times already.