If I'm understanding this correctly, it isn't the bend, but an obstructed airway on an estate pipe? If so, Peterson may not be to blame... for once, ha ha. It may be that the pipe has never been cleaned down the draft with a pipecleaner. This would not be unusual for an older style pipe smoker. Many pipe guys in my family never even used a pipecleaner once. Just smoke it till it stops, and toss it, get a new one.
It may be that you need to just run a drill bit down the draft, NOT WHILE CHUCKED IN A DRILL, but just gingerly run down the stummel. This should shave off some of the cake in the draft. Then clean the heck out of it. I might even suggest a retort.