I did a 2x1 snake using Weber briquettes 80% of the way around yesterday, and it stayed 250 for 9 hours, with all the vents wide open. It seems like when I tried a 2x2, I had to mess around with the vents to keep the temp from going too hig. I have never tried the minion method. Worst comes to worst, you will have it smoked as much as it's gonna be, and you can always finish in the oven if necessary.
I wrapped mine at 200 and put it in a cooler for 3 hours. Then it was like butter to shred it!