I have 55 cm Albatross bars with a 110 mm 90-190 stem on my 1984 Miyata ATB. Pictured components are ESI chunky grips, original full-hand Dia-Compe levers, and Deore XT 7/8sp thumbies. Oh, and I'm 5' 10" with about 42 cm shoulder width, as a tailor would measure, and 95 mm palm width at the widest point.
With this stem length and grabbing the bar near the ends, the center of my wrists are right in line with the steering axis, which is perfect for me with this longer-than-a-road-bike 58 cm top tube. I tend to grab up against the levers (about 2 cm forward) when standing and mashing; I'll chill in the middle right on top of the levers & shifters when spinning; and grab the front bends when going fast. I marked up and attached a photo showing measurements at my usual grip spots, right about where the center of my wrists are. Overall bar width is great for me, though I could imagine going slightly wider and a teeny bit less sweep.
I like this setup and probably won't change much in the foreseeable future. I've gotten rid of so many of the original components that I feel bad getting new levers, but I may try bar-end shifters eventually. My main gripe is the thumbies taking up the space in front of the brake levers (tried mounting on the inside, still had cable in the same spot, and didn't like the feel of shifting that way). If I had levers with a narrower clamp/band and bar-end shifters I'd gain a little more room before the bends. Though, this is some very low ROI dialing in sort of minutia. It is nice shifting with my hand right on top of the thumbies, and shifting while gripping on bumpy rough stuff is great too.
I'm intrigued by other bar possibilities like the Billie or Choco, but I don't want to be any further forward on this frame. If the top tube were shorter then maybe I'd try them. If I get any other bars for this frame it'll probably be Magic Components Mothbars, but I'd have to imagine I'd need a 130 stem for those.