Here's my bike:
After (slow) rides of (mostly level) 160km, I'm tired. But no part of me is particularly tired. "If [the bike layout] ain't broke, don't fix it." But, but: a commonplace of writing about bikes is that drop bars are good because you have a variety of hand and thus upper-body positions. And certainly I often do want to move around. But the drops are so low that I never want to use them for the sake of change. (I only use them when countering a vicious headwind. Not for aerodynamic effect when going downhill: I prefer enjoying the scenery at 40km/h to dicing with death at 60km/h.) I presume that if the bar were higher I'd often want to make use of the drops: more variety, and I hope less general tiredness.
The stem's now at the highest position Nitto recommends. The top of the handlebar is about 7cm below the top of the saddle.
The general opinion in for example the thread "Touring handlebar height" seems to be "do what's comfortable". But I have only a year's experience of "serious" cycling so I imagine that a big factor in what's comfortable is what I'm used to. (I also imagine that raising the handlebar will move more of my weight onto, and greatly increase my annoyance with, the saddle.)
If I bought a new stem, I think I'd get the modern kind (I forget the name) and an adapter and (if needed) spacers: easier to fiddle with later. But maybe I should instead stop whining, be grateful that I don't have any particular pain, and continue as is.
Suggestions? (I'm thick-skinned, so if "STFU and HTFU!" seems appropriate, just say it.)