I've done a LOT of chicken since receiving my 020 earlier this year. Some thoughts;
250* is temp I use most. Allows a lot of smoke penetration and nice finish color. I've also done entire cook at 300*. Its faster but smoke flavor is just slightly reduced. 250* - 275* for me.
I think I read that poultry skin begins to crisp at 325* - so just know that. It won't happen at 250. I fantasize that the ultimate chicken would be slow smoked to some underdone temp and finished on a rotisserie grill. If I had a rotisserie...
Chicken temps can climb/peak fast with higher cook temps. Brining mostly helps retain moisture. The hens I get from Costco are as close to 'pre-brined' as you can get. Very light olive oil, rub and go.
CS chicken rub is REALLY good on smoked poultry. It's spicy so no need to over do it. I'm on my 3rd jar this year
I prefer to remove the back and lay'em flat. I've also removed the thigh/leg combo, probed breast for 165*, and leave thigh/leg combos in extra 15/20 minutes. Tender breast and no pink dark meat
I prefer the breast meat sliced for sandwiches and the thigh/leg combo cold the next day. Smoked chicken salad (with right recipe) is crazy good.