Hey greasesleddin
Small world... I am also in Bangor, ME (well Greater Bangor area). My wife and I got our Mt Vernon on Nov 13th and love it!
We've had a few "minor" problems but those now seem to be resolved. We had what I thought was a fan wobble noise... I ended up tearing apart the stove last night and finding the problem. It was a fan wobble on the convection blower but not because the fan was bad... it was the fans mounting bracket that was wobbling (too much play), a little bit of felt padding and things are much better!
Anyways, we're running our pellet stove above 70 degrees and only use at most (at these current temps) 1 bag a day... it sounds like something is wrong! Is there any unburned pellets in the ash pan? What is you cleaning regime? What brand of pellets are you burning?
When I took apart the stove I noticed that two screw holes were present were two pieces of the metal met on the exhaust-side near the exhaust blower... I ended up adding two machines screws. We also had this weird harmonics/vibration that would shake the house. I found that was because the O2 sensor that is in aluminum case was vibrating against the burn chamber. I bent the bracket away from the burn chamber an inch or two and things are much better.
From what I have seen the Mt Vernon is a well built and well thought out stove... unfortunately I think the the rush for pellet stoves this year has caused Quadrafire's quality control to become laxed a bit and favor of quantity over quality.
If your not comfortable tearing apart the stove then I would suggest contacting the dealer.
Good luck!