With baby backs I have good luck in the drum smoker with a two hour cook. No more do I overcook ribs. 325-350 degrees raised grid, indirect drip pan setup below. Apple or hickory wood smoke.
1/2 hour bone side down.
1/2 hour bone side up.
1/2 hour in foil.
Remove foil and indirect setup.
1/2 hour over direct heat flipping often with a rib juice (mop) or sauce until the edges crisp up and ribs darken to the color of a sunset. Then I'm done.