Are you still experiencing battery drain with 8.06 update? My device still drops 3-5% a day when turned off or when in "sleep".
I've had edge devices since the 705 in 2008. I've have never switched the various devices off - just let them atuo-sleep. My Explore 2 (8.06) loses about 10% a day. Out on a ride, it uses about 5% an hour (I use north up, not track up, so my screen possibly doesn't get refreshed as often). I'm ok with this, but just a little puzzled as my 1000 could go weeks in sleep without seeming to lose any power. I say "seeming" because I can't be sure that the power meter is reliable. I always leave my Explore on Indoor, hoping it won't waste battery trying to search for a gps signal. I haven't tried switching off.
I'm also on 9.07 and have been decided to try Power Off (in the past, I have just let my Garmins go to sleep). After a full charge, I powered off and have checked every day for the past 10 days or so. Battery has been negligible (still shows 92% today). There is a big proviso here: I'm not 100% confident that the display is accurate because there have been problems with earlier firmware. Would be embarrassing leading a ride relying on a faulty display! To be fair, I haven't had any problems during the past 6-9 months (3-4 rides per week) so hopefully that's now sorted.