I have switched to 3 - 1/2 - 1/2.
I do the first 3 hours on Hi-Smoke on my CC Woodwind ( about 225 ).
Wrap in foil upside down for 1/2 hour at 225 and then 1/2 hour unwrapped at 300 with a bit of sauce brushed on.
Did some last night that came out pretty good. They were sold as baby-backs but were on the meaty end, for a smaller rack I might cut down to 2 hours or so for the smoke.