That 180 mile drive starts out up a medium sized hill, then down quite a large one. Observed the following new-to-me effect: charge was down to 92% at the top of the hill, and regen was unrestricted. As I rolled down the large side of the hill, regen was normal until I picked up 1% of charge -- that seemingly magic 93% - then regen restriction kicked back in and got tighter and tighter so my charge level never got above 93% all the way down.
This car *really* seems to want to max out at 93% right now. We'll have to see what they say at the SvC next week.