Hi Russ-
The skin came out super - slightly crisped and nicely coloured as you can see.
The tips I picked up from the book were:
1. After brining the chicken, place on a rack to dry while making the fire - pat them dry with paper towels and then let them sit for the 20-30 minutes while waiting for the pit to be ready.
and
2. The last 10 minutes or so, I opened up the vents allowing the WSM to get hotter (like 300) - and I put a light glaze on them.
If you do both of these and it still isn't crisp, you can put them over the hot coals (on the bottom rack without the pan) - and they will crisp VERY quickly (like in seconds...)
The book explains this and more - it is excellent!
Hope that helps,
Bill