Baby backs usually don’t have a lot of fat on them like spares, so I think they are best smoked at lower temps. Sometimes I cook them unwrapped the whole time but I think they need more basting along the way to keep the surface moist. But having to open my UDS smoker up so much keeps my temperatures rising a lot. Sometimes I use a modified 2-2-1 method and cook around 225 for around 2 hours. Then wrapped (meat side down) for another 1-2 hours, depending on how thick and meaty they are. I’d check them after 1 hour wrapped and then keep going as needed. Once they are close to the tenderness you like, unwrap, then sauce if you want sauce and let it setup and check on them every 15 minutes or so until you are happy with them. All these times and temps will vary. Everybody has their own preferences, plus every rack is different and might cook a little different. I know that’s a lot of babying to do, but it can yield some awesome Q.