I may have finally reached my bar width limit.
After slowly creeping up from 560-580mm in the 90s to 750-780m in the last few years, I tried bumping up to 800mm on my FS bike. This is the first time I have ever gone 20mm wider and not been sold by the end of the first ride.
It seems counterintuitive, but it is actually on the climbs that I really liked the extra width. In particular technical climbs where I am out of the saddle pushing a higher gear. I also liked it in the corners. It was the "just riding along" part that it seemed like it might be too wide.
I'll give it another couple rides, and it I don't change my mind I'll go back to 780mm.