It's taken me all week to post about the results, apologies. Fantastic. I took pics, but I need the wife to help me out and get them uploaded.
Besides for the shortened cooking time, for me the real magic was that the method let me screw up big time and still recover. Since the temp rise was slowing down, I lifted the lid off a fraction to speed things up. Had to go be a good parent, when I got back a few minutes later temps had shot up over 400! Took me some time to shut the vents and bring the temps back down into the desired range. And then my meat thermo went on the fritz, so all I had was time and grate temp to go by during the cook. Nonetheless, I foiled at 2:30 in and just let it go per procedure. Found myself probing at 3:50 with a thermo (temp was 200+!), felt resistance, wrapped it back up. While part of me was petrified that I'd overcook it, I found myself muttering a mantra along the lines of "Kruger says temp don't matter, cook till tender, cook till tender." 4:37 in, I decided probe said "done." Foiled in cooler for 2 hours until dinner.
I feel like I still suck at pit temp control and adjusting the vents, but this one worked beautifully. 10lb+ packer, not a scrap left.
Gonna switch gears and do a chuck roast low and slow for pulled beef tonight. Can't wait to see/eat the results.
Thanks to all who contribute here...