I put two racks of spare ribs on the smoker at 11:00AM today so they would be ready at 5:30 or 6:00 and was using the 3-2-1 method. I had the smoker temp set at 230 and smoker temp was averaging 225. I smoked the ribs bone down until 2:30 then wrapped adding apple juice inside the wrap and cooked until 4:30 then removed from the foil even tho they didn't feel tender at all. I cooked for another hour and the meat hadn't even began to pull down the bone from shrinkage so I wrapped again and added more juice to the wrap. I placed the ribs back in the smoker and cranked the smoker temp up to 260 and cooked until 7:00 at which time I pulled and checked them but they still weren't tender so I cooked them another hour. They were a little better but still not as tender as normal. My smoker thermometer and my thermapro were pretty much consistent with one another throughout the smoke. I've never had ribs stay tough smoking like this and especially after cooking for this long. Anyone have any ideas why they wouldn't get tender. Bought at Walmart last night on sale. A buddy of mine suggested they may have been frozen twice although they were thawed when I bought them.