I'm just going to add another perspective on baby backs......
- point - baby backs do not have to be cooked for very long to be out of this world good. Example is cooking a Rack of Pork roast.... The roast below was just under a 2 hour cook at 265 to an INT of 145. you can see the center is still pink, ie perfect loin temp. The next thing is the section of bone is effetely a baby back rib...At an INT of 145 - 150... they are out of the world juicy and tender....Note the loin meat is perfectly cooked in this case
In the case of just ribs....and for a cook "above" 145-150 INT then remove the loin meat. The example below shows it removed. The rack on top comes that way the rack on the bottom I removed the loin. Stay away from the packages that say "extra meaty"... this is just more loin meat that doesn't want to be cooked to a higher INT temp....The exception here is you want to "grill" them and finish them at a lower INT around the 150 then they are tasty!
Next up is Baby Backs usually don't need more than 4 hours unwrapped to be cooked enough to be rendered and tender.... In the case of the two above the top is 3 hours total cook and the bottom is 3.5 hours total cook time. I cook baby backs at 235 chamber temp.
My steps.... I like to section them in portions to get serving size with two edge cuts per plate. I do use mustard to get a dropped in the sand rub coverage, but mustard isn't required.
Next I smoke them rib side down for the 2.5 or 3 hours depending on rack size, this is two hours in
then flip (the 2.5 hour mark for small and 3 hour mark for larger) and mop
Once that is set I flip over and mop the meat side....I plan on a 15 min set time so this takes a total of 30-35 mins.
Next I transfer to the kitchen oven and hold at 140 till dinner time if needed. I usually end up holding them for 30 to 45 mins. and then I glaze and broil finish them (I watch them like a hawk so they don't burn) Usually 5-6 mins of broil time. You can go right to the broil if you don't want to hold. You can also finish them on the grill to glaze them if you want a bit of char on them, you just may loose some glaze...
Perfect baby backs virtually every time
I will note that these are not FOTB ribs as I don't think baby backs are good for that (spares are if you like them that way) These will be 90 pull from the bone with a bite, but tender and juicy.
IE so my advice is to remove the loin meat, reduce the time of cook, mop at the end, and then glaze finish...
If you can get your hands on these they are worth their wt in gold! These are the small rack example above......