I use the Cajun Bandit stacker on my OTG 22.5 with a charcoal ring and heat deflector. The end result is very similar to a WSM just shorter height.
I don't use minion - I build a fuse setup and can get 8-10hrs out of a thin "snake" of coals with proper vent management at 265 degrees.
I think the minion method is awesome, but you can end up with a whole lot of lit coals, which can lead to a runaway fire and a hard battle to keep temps down.
Give the fuse a try - I think you'll like the efficiency.
Cat Daddy's BBQ : 22.5 WSM / PBC / Weber OTG 22.5 Cajun Bandit / Smokey Joe Gold