Good Morning wild west. Welcome to the forum. I see you just joined, so when you get a chance, slip over to Roll Call (you'll find it in Announcements) and tell us a bit about yourself--where you are, what you do, interests, smoker, etc.
As to the stall....its normal, and just a fact of life we have to live with. When the meat stalls, you can do a couple of things. You can just let the meat be (leaving the temperature setting stay where it is, and it will eventually start up again (during the stall, the meat continues to cook and tenderize). Or you can foil the meat with or without some foiling sauce. This will speed up the cooking process, but you'll find that it softens the bark. Like you, I have a MES 30, and I never get much bark anyway, so I always foil. Most times when I foil, I put the meat in the oven at 250* until IT reaches my desired temperature. With Pork Butt, that's 205*--then it pulls easily.
You'll learn pretty quickly not to count on the meat being done at a certain time. All smokes are different and will take different times. Factors like weather, size and quantity of meat, and often you'll just get a contankerous piece of meat that won't cooperate, all affect the duration of the smoke. One of the most important phrases you need to grasp and truly believe is: "The meat will be done when the meat is done."
Hope this helps.
Gary