The picture looks tasty, Dave. Just as a side-note, you may want to edit your pictures in something like MS Paint, to reduce the size. Really hard to view giant pictures.
I can't tell if it's a picnic cut, or a Boston butt, or if it's bone-in or boneless. Believe it or not, not all "pork shoulders" are created equally! I find the picnics to be drier than Boston butts (picnic is the lower part of the front leg, and shaped more like a ham, and the Boston butt is the upper shoulder, and is more "square"). Like Gregg said, too, try brining. Once you brine a pork butt, you'll never go back to "plain" pulled pork!
You mentioned "pull it at 180;" this won't work for pulled pork. It would be fine for slicing, but the internal fat and connective tissue won't be rendered at that temp. Heck, most of the butts I do don't even hit the stall until the low 180s! That's where the real magic happens!