I only do spares trim to st.louis style. heres how i do mines, i smoked them around 250/270*, for 2 hours, place in foil for one hour back on smoker at around the same temps. take them off and let rest for a few and then on the plate to eat. i have done the 3-2-1 with them but they come off way over done( to me). one the rare time i done baby backs i do at the same temps but only 2 hours in the smoke and the 45 mins in foil.
just my 2 cent worth