Thanks for the comments and links to pictures. I searched quite extensively for fit principles, but found that the vast majority are aimed at competitive athletes, mostly triathletes and time trialists.
My understanding is that there are 5 adjustments to consider (see diagram below). If you have information on how to adjust settings, I'll read with interest. At the moment I am inclined to use default settings and to keep Allen keys close by.
- Height - for touring, the suggestion is to significantly raise the aeros, which should improve comfort
- Tilt -- I didn't find much about this. The manufacturer suggests starting level. Then it is like salt: "adjust to taste"
- Length -- nothing here. I assume that it depends on the rider forearm's length, and on how you grab the bar
- Slant -- It looks as if several competitive riders prefer a slanted layout (prayer mantis). Others criticize it and suggest a vertical layout.
- Pad -- depends on the model. Mostly alignment. "adjust to taste".
From what I saw, competitive cyclists favor low and level aerobars to reduce their CdA, whereas tourers prefer raised and tilted aerobars, for comfort.
