To further update this:
I started running at 70% brightness and I'm happy with that level, it's only slightly dimmer than my previous 80%. At 70% yesterday I got almost 9 hours of screen on time, that seems like an acceptable compromise to me. Sure I could stretch it to 10 or even 12 hours but it would be at the expense of screen brightness to a level I'm not comfortable with. Besides 9 hours easily gets me through a day with plenty to spare.
I started running at 70% brightness and I'm happy with that level, it's only slightly dimmer than my previous 80%. At 70% yesterday I got almost 9 hours of screen on time, that seems like an acceptable compromise to me. Sure I could stretch it to 10 or even 12 hours but it would be at the expense of screen brightness to a level I'm not comfortable with. Besides 9 hours easily gets me through a day with plenty to spare.