So I make my first foray with the new propane smoker. I folowed all the rules: Kept temp right at 225 degrees, used a good dry rub, kept water pan full. And after 5 1/2 hours my spare ribs were -- awful. Not even close to being tender. So the question is: What did I do wrong? Do spare ribs take more that about 5 hours at 225? Help please.