Joseph / Smokin:
Some good news and some bad news regarding the results.
Good news - Followed your advice with 250 and the chickens registered 165 white / 180 dark at the 3.5 hour point. BTW - Used Empire Kosher chickens which really don't benefit much from brining. The smoke was perfect at 2 oz. Skin was still somewhat rubbery but the meat was very moist and tastey. Simply removed and tossed the skin and it was a hit with all.
Bad News - Never again will I do beer can chicken on a CS. Had trouble keeping them upright and, as mentioned by Smokin, I don't think it really adds much, if anything, for all the hassle. Also, used 3 TBS CS Poultry Rub mixed with 1 cup mayo. Rubbed both under and on top of the skin. When I opened the smoker at 3 hrs to check, the mayo in the "somewhat" vertical birds had liquified due to the heat and was leaking out. Hell of a mess but, once I got everything under control, it was a damn good meal.
As an aside, the last check with an instant read was at 3.5 hrs and everything was perfect. Turned the smoker off, closed the door so the chickens wouldnt cool too fast (22F), and went to get my neoprene gloves, foil, and a tray. Returned, opened the door, and there sat another dead instant read still in the chicken's thigh.(happens 2 - 3 times a year).
Lessons learned here - Forget the beer can, forget the mayo (at least in quantity), remember the instant read.
Thanks again