Yeah, I'm curious about the sweet spot for aerobars, too. 99% of the advice for aerobars comes from the road TT/Tri communities who have to ride them for 40 minutes. Taking their advice for aerobar fitting would be as appropriate as taking their advice for drop bar fitting. Similar, but different-enough to warrant further investigation. Especially in a sport where winners and losers are determined by less than a second at the world level and a few seconds at the local and national levels.
For example, Sarah Hammer, one of the best ever...if not
the best ever pursuiter, rides with very wide elbows which is very contrary to what you'd see at the world level for Road TT or Triathlons:
Even wider than her teammates:
I gave my aerobars to @
theblackbullet. He's much faster than I ever was on them