Since loin backs are leaner than spares, they cook up quicker, just like any other lean meat. I like to do them a bit faster, and will power through at around 300-325 for 3 hours. No peeking, foiling, spritzing. They'll pass the bend test, and won't get rubbery, or dry. Just moist juicy goodness.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. SJS Mini-WSM. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)