I ended up smoking for 3 hours at 225-250f. I spritzed them every half hour until I wrapped them.
I eventually let them go for another 3 hours in the foil, as they didn't have enough pull back on the bones after two hours.
At this point I was worried that they still had even longer to go.
However, I unwrapped and placed back on the grill for half an hour before saucing them up with some Sweet Baby Ray's bbq sauce and then let them go another 20 minutes.
After resting for another 20 minutes they were finally ready...