Yeah when BP said the stall was due to evaporative cooling I had the same thought about the mop - I was probably hurting the time. So if you foil wrap at 165* that means to me that you are no longer getting any additional smoke. Is there a difference in appearance, moistness(??) or taste between a wrapped meat vs the method I used?
You actually quit taking on smoke in the meat around 140 degrees, so at that point you are just further developing/concentrating your Bark. I wrap at color, not temp. When it is a nice dark red, I wrap. I dont like my bark black. I usually am about 5-6hrs in and roughly 160 when I wrap. I also use the wrap to add more flavor... by adding a braising liquid. I put about 1/3-1/2 cup of this marinade called Smoke On Wheels Pork Injection and Marinade into the foil when I wrap. (that was a shameless plug, btw, since I produce that marinade...) You can get it here: SoW at Big Poppa's! Continue the cook until the meat is tender to the probe. Could be anywhere between 185-205, just depending on the butt, and seasoning methods (aka, did you brine or inject it, or just rub?). Sounds like you had a good first outing. Pics for the next round. <I am the worst about pics>