I just bought a 30" Masterbuilt propane smoker. I've never used a smoker before, but I've grilled for years with both charcoal and propane. I just tried my first batch of boneless pork ribs and they came out so dry and hard they were too hard to eat. It was almost like big chunks of jerky. I used a recipe where I cooked the ribs in the oven before i put them on the smoker. They were tender before I put them on the smoker. I had it on the lowest setting. It was a warm day, so it even on the lowest setting it got up to around 300 degrees. I cooked them for about an hour and 15 min, then dunked them in sauce and put them back on for about 30 minutes (maybe not even that long). What did I do wrong?