I'm assuming that the muscles in that loin are going to be pretty long compared to the ones in a shoulder? Just throwing this out there, but would it help the pulling if the loin were sliced into sections about 3" long prior to the slow cooker? Shortening the muscle length might also hasten the drying out of the meat though, so I'm not sure if that would accomplish anything.
I've cooked the whole loins in the slow cooker with great reviews before, but I just wanted some smoke on them for something different. I had intended to smoke them for an hour to an hour and a half at 150 on the DB, but ran into a dear friend I ain't seen in 10 years or so at the grocery store. They smoked for two plus hours and this is how they looked. It was 2 3/4 pounds of little loins.
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I cut them into thirds to make pulling easier.
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Hope the pics show up. I'm going to quote all of y'all that say get a vac sealer in my request for the need of a vac sealer, too!! Bonnie is a tough sell, though. I'll post some pics of the finished product if these come through. It's in the slow cooker still and smells wonderful!!