First time I tried baby backs. My wife was at costco and I told her I wanted spare ribs and she brought these home. I will just have to try the baby backs again when these are gone. I am still learning the quirks of my smoker like you said. Had a lot on that day. 3 slabs, 8 hamburgers 10 chicken strips and 17 chicken legs!!!! Not all at the same time of course.It’s a general guideline. Size of racks, quirkiness of your individual smoker etc come into play. When they’re done they’re done is the way to go