OK, so today I dug into the Brose settings, mostly to fix the clock. Now I understand more.
The factory settings are:
This is why I wasn't using Eco, it was not adding much of anything.
So I reconfigured it to:
I am now riding on all power levels. Eco on flat ground for more exercise.
Tour is my new default setting, and I just leave it there when I don't want to think about the power settings and just ride.
I like Sport at 75% for short bursts and Boost on the big hills.