I'm 6ft as well and like The wider handlebars 780+ but notice I started to get shoulder pain and other issues because of it. Most of my bars these days I cut down to 750 and no longer have any issue.
I had the same problem, I'm a 5'5 woman, and was getting some shoulder pain after rides. My bars were factory, 780, on both my bikes (Mukluk Salsa fat, and Santa Cruz 5010), I cut them down to 715 on the Santa Cruz, and then added a 70mm stem and what a world of difference!! I am going to do the same on the Salsa soon. The length of bars is HUGE compared to what I've ridden in the past, I heard it was because of the wider wheel base, but I suspect it's a cost issue with the mfctr, not wanting to carry / assemble handlebars of differnt widths. Seems Crazy to be squeezing through narrow openings btwn trees here on the singletrack with such wide bars. YIKES!!