Well, I'm a little late getting back to this, and please forgive me for not taking pics, but for those who would like to know what I wrote down in my cooking journal:
If ROASTING split chickens in the wsm, only put one bird, the smallest, on the bottom rack. (One side of one of the lower rack birds got pretty dark well before the other halves were done.)
I doubt it will make much difference, but I'll try foiling the pan with no air pockets for the most radiant heat possible. (Top grate birds done much sooner, and cooked much more consistantly than the two on the lower grate.)
The brine was very helpful (great taste, texture, and moisture retention), and from now on I'll try to brine any poultry that includes breasts. (I used 1/3 cup Morton kosher and 1/4 cup brown sugar for each bird, with two halves to a gallon bag, for about four and a half hours.)
Don't sauce any next time. Just have white sauce on the table, because it's easier and everybody seems to like it best, anyway.
I'd like to hold to the idea that turning and rotating is for grilling, so this is my queastion: I wonder if there would've been as much inconsistancy cooking down around 250, versus up around 325-350. Anybody have any experience with both ways of cooking a full load of split chicken on the little wsm?