tried another set of ribs on the smoker. Two racks of baby back hormels at 230 degrees for 4.5 hours and they did not shrink down on the bone real well. I probably should have let them stay longer, but i was afraid they would dry out. How can a med size set of baby backs take 4.5, almost 5 hours. My spares have taken 5 hours, but not baby backs. Should i have left them on another hour or so? Can one set of baby backs take 3.5 hours to get tender and the next set take 5.5?