If you haven't done so, it's a good idea to monitor the temps at your grates upper and/or lower so you gain an understanding of how your MAK performs. My 2 Star upper grates usually runs 25-30ºF hotter then what the Pellet Boss is set for. If fact, the higher the PB is set, the larger the variance & swing. Lower grate seems to hover around 15-20ºF hotter. For me, a good starting point for smoking a brisket on the upper rack is to set the PB to 245º but regardless of which grate, I want the actual grate temp in the range of 275-285ºF. On this smoke I tightly wrapped it in butcher paper after it had been in a short stall when the IT was 168-170º.
While is was nice of MAK to include a bag of Bear Mountain pellets, I quickly became disenchanted. Way too much ash which can be a problem on long smokes, plus the MAK had some crazy temp swings. Full disclosure, I hadn't emptied the fire pot since my usual goto pellets never presented an issue running 2 to 3 smokes before doing so. Anyhow, I immediately went back to what I've always used, BBQr's Delight - Hickory which was used for this brisket. :) Plus to ensure things I'm back to religiously emptying the pot before each smoke.
Brisket: If you can, find one with a thicker flat. I now subscribe to the adage of better to leave more fat on than trim it too much. The obvious large hard chunks get removed and more, but I'm ok if there is a bit more than 1/4" left. NOTE: weigh ALL of the trimmings you've removed so you'll know exactly how much the trimmed brisket weighs. The above MAK setup has resulted in approx 40-45 min/lb with the last two briskets I've done (trimed to 12 & 10 lbs). Remember that timing is only a guide, each brisket has a mind of its own.
Two other things I did on this smoke:
1 - when I decided it probed tender (still having trouble coming to grips with this) it was pulled, the butcher paper cut open & peeled back to allow the heat to dissipate for 5-10 min before placing in a cooler with towels. Cooler was set up with a bottom beach towel, sheet of heavy alum foil, brisket in butcher paper but still opened, sheet of heavy alum foil, and the top beach towel.
2 - rested the meat for only 1hr 20 min.
Why these? Because previous smokes were pulled and put directly in the cooler and rested for multiple hours before serving. Hey, the kids don't always show for diner when they said they will. o_O I believe doing those two things allowed the cooking process to continue too long causing it to be over cooked.
It's still a learning process for me but that's all part of the fun. :D
Remember to take good notes on each of your smokes! ;)
Matt