I recently got the same model Pit Boss, I picked it up at a trade show direct from the manufacturer. They had used it for 3 days as a demo unit. I dont know what pellets were initially in there but the heat did creep on me the first time or two I used it. Which did prompt me to actually read the directions and find this thread. ( I had not adjusted the 'P' setting). I also had no idea what pellet type was in the hopper when I got it.
I then loaded it with a Cherry and Oak mix I hand blended from stock Traeger pellets. Couldn't be happier. It has been holding smoke temperature great and not had any significant drift. Had no problems doing Salmon, Cheese or 3-2-1 ribs. Best ribs I've ever made.
My only desire really is that the 'P' setting not default to 4 every time you turn it on, or just have a dial instead of a recessed micro button.
Not to over analyze but I grill at 7,000 ft altitude, and perhaps the oak slowed down and evened out the temps, but honestly I think I was just getting used to using the product.
Great interaction with the company when I met them. Not to make excuses but as a small business owner our customer service can suffer a little when we are at trade shows. Perhaps the original poster and Pit Boss had a similar bad timing issue.
I've owned a few $600 to $800 gas grills, first time with a pellet grill, but I couldn't be happier and the other more expensive grill is sitting around unused.