FYI I'm at hour 15 and I made two errors with my minion method:
1. My cooker is out of round and leaks air pretty bad-gotta fix it!
2. I didn't cose down the vents quick enough on the way up.
Ergo, the first few hours of the cook the wsm ran steady around 290. Meat on at 8pm, me asleep at midnight, all bottom vents closed. 7am the wsm was down to 230 and almost out of fuel. Added some more and even though the internal temp isn't up to 190 yet, the 7.5 lb shoulder feels done. Time to wrap and hold.
I'm sure it will still be quite tasty!
Bob