I'm thinking of dropping mine down to a 3.3. I had an XTM 24.7 in it (pretty close the the M26 you have), then upgraded to an LRP28... now it's just stupidly overpowered. 2nd gear wheelie/backflips are annoying.
I've never had a 3.3, but I have had a 18TM and supposedly the 3.3 is a bit stronger, so I might try that. I tried the 18TM I had before going with the BB and it just felt weak to me now that I've been running BB's for so long (aftershock/savage).
That said, for what it is and where I have to drive, something quieter that gets longer run times would probably work better for my needs. The LRP28 is a thirsty SOB!