Well, the results were fantastic. I was a bit skeptical but once I took a peek under the foil when the temp hit 195 I was very excited. I took it out of the pan and wrapped in foil and then in a towel and put in the microwave for an hour. After the hour I pulled it into nice slivers. I was really happy with the end result. My kids even liked it too. The bark was very good indeed. I've posted some links below to some pictures.
Rubbed and ready for the grill -
here
After 3 hours in the smoke -
here
When temps hit 195 I brought inside and wrapped in foil -
here
Pulled and ready to server -
here
Some observations: gotta get the cooker at the right temp from the start. Don't pack the ring so tight and use a full chimney of lit coals to get things going. (I only used 3/4 of a weber chimney).
When applying the rub, I did not get it all the way covered on all sides. I missed a few spots so my bark didn't form all the way around. Silly mistake.
I did inject the meat but not nearly enough. There were spots that were a bit dry and others that were nice and moist. Probably because I rushed and didn't inject all the way around.
I may consider removing the fat cap altogether next time so I can get more bark all the way around the butt. I may also consider dispensing with the aluminum pan again with the intent of getting more bark to form.
All in all not a bad first run. Thanks for the help guys.