You are doing just fine. Either fat or plus and good to go.This place is too divided. For the past year my Pugsley has been set up half fat with a 27.5x2.5 in the rear and 26 x 4 in the front. I get the stability and braking of the fat front. The acceleration is way better with the narrower tire in the back.
A take off that was in the back room of my local shop. He thought it may have came off a Salsa Timberjack, we were lucky enough to be able to dish it over for the offset. I don't keep up with the details, all my bikes are old.OP, What rim are you able to run a 2.5" tire on a Pugs?