Just to follow up. This is my 2nd slow and low cook ever on a ceramic egg.
I had a little fluctuation when re-using charcoal from my first cook. I found that it needs a little more air to be stable at 225-250F, so the vent openings were a little bit wider.
anyhow, I also used a different baby back ribs, these were from costco and they're much thicker. Which worked out much much better. I did a 3-1-0.25 cook, 3 hrs unfoiled, 1 hr foiled, and 15 mins unfoiled with a little sauce. Turned out perfect. Ribs were tender and still juicy.
I've been converted... to the slow and low style of cooking ribs.