I've been having some excellent results with 5-hour packers (avg 13 lb), but I've not been particularly thrilled with 100% high-heat butts so far. I'm quite pleased with the texture of the fast packers, but less happy with the greasier texture of the fast-cooked pork. It appears to me that the rendering process is not working as well with the slower pork cooks so far, so I'm still trying to tweak my approach to get through that problem and figure out what I'm doing wrong. I contemplated a higher acid content in my injection, but I tried that once and wound up with mush. Typically, I still prefer just to run the butts all the way through at 240-250-ish with no foiling at all until they come off the cooker, but do sometimes speed them up in the latter half of the cook. Gonna have to study up on Ed's post as mentioned above and get a little more education on the matter.
That being said, if I know that I'm going to run into time issues, I do keep the temp down on them at LEAST until they reach 165-ish. Then, if I'm running out of time, I'll double-foil them, add a little savory/sweet liquid concoction, and run the cooker up to 325 or so to finish them up. (Or, if I'm just cooking at home and I'm on the way to running out of fuel toward the end of the cook and don't want to reload, I have no compunction whatsoever to setting the kitchen oven on 325 and transferring the well-wrapped butts to the oven on sheet pans to finish up. Heat is heat when you're sealed in foil.) Drain out a little liquid before wrapping in towels and polar fleece tag ends from Walmart and into the cooler they go. (If tenderness is where I want it when it comes off, I leave the foil open for 10 minutes or so to help slow down the cooking process so good meat going in doesn't become mush coming out.) Keep the juice, cool it in a separator, defat it, and mix the resulting pig jello into your butt moisturizer of choice to add to the meat when you pull it. My quart mason jars labeled "butt juice" do tend to raise some eyebrows upon occasion - serves 'em right to worry, if they're poking around in my cooking area where they don't belong! :icon_pissed ( :wink: )
Keri C, still smokin' on Tulsa Time