Soooo, after sitting in the secondary for three more weeks, I finally racked it to a keg this weekend. It doesn't quite have the Prarie Bomb mouth feel, but damn it tastes fantastic!
I'm carbing the keg to 1.5 volumes of CO2, and intend to put it on Nitro in a couple of weeks when I'm back in town.
Meanwhile, I've got an Oskar Blues Old Chubb Scotch Ale clone carbing up, which should be ready to pour on Friday. I had to brew something while I was waiting for the PBomb to settle.
If it turns out to be good I'll post the recipe.