Thanks to all of your for your help on this. I ended up cooking 9 racks of ribs for my son's birthday. I did buy another rib rack and did 4 on the bottom grate and 5 on the top, with one leaning against the rib rack. See the pictures here:
Birthday Ribs
I decided to buy the ribs from my favorite butcher the next town over. I know I overpaid but I didn't have time to trim and de-membrane 9 racks. They were all about 2-2 1/4 pounds each and were beautiful.
I started the grill around 11 using minion method with about 12 lit coals looking to get to a grate temp of around 225. Also used cherry wood and some hickory. I used water this time with the brinkman pan in there filled to the top. I did have some significant problems getting my temps up. It took forever with 9 racks and a full pan of water. I did a number of things including taking off the door for a while. I will say that I was having some problems getting what I believed to be an accurate grate temp with my ET-73. I also have a turkey fryer thermo in the top vent and that was consistently showing me a temp about 20 degrees higher than the Maverick indication. I'm still not sure what is going on.
Anyway, I ended up cooking them about 3 hours and then foiled the racks with a sprinkle of brown sugar. I usually use apple juice but we were out so I used some Trader Joes Raspberry Cranberry juice instead. After 2 hours wrapped, I took off the foil and they were about done. I think that with all of my messing around with the temp problems early, I probably should have had them wrapped in foil earlier. Oh well. I put them back on and sauced them, just with Sweet Baby Rays on both the WSM and the gasser since I needed the room.
Bottom line was that in spite of the problems I had, they were incredible. I truly think the cranberry juice put them over the top. My wife, who isn't a rib fan (I know, I know!) said they were by far, the best ones she had ever had. Also, a couple of my son's friends couldn't come and we only had six of them eating instead of 8. That being said, at the end, we had exactly 5 bones left. They polished off 8 1/2 racks of ribs, baked beans, Cole Slaw ala Doug D (from this site), and a pan of corn bread. They were battling to see who could eat the most and the winner had 24 bones on his plate.
Thanks again for all your help. Unfortunately, I did not get any after pictures because these boys were starving.
Bob