3 hours in heat then wrapped for 2 hours and you'll have pork soup. They will be overcooked. If you insist on wrapping in foil, I'd do 2-1-30 minutes and check 'em with the bend, poke or bone tug test for "done". The 3-2-1 method is designed for whole racks of spare ribs cooked at ridiculously low temps.
To prevent them from overcooking during the rest, lest them sit unwrapped on the counter for 15-20 minutes before wrapping up in foil or plastic, or whatever.
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)