Hey Sarge,
I cut all ribs in half to fit on the shelves (3 half racks per shelf). And I alternated the pattern on the shelves every other shelf. I put the thicker ends of the ribs on the bottom two shelves. And I did not press all the ribs together, I tried to leave space for heat and smoke to circulate around the meat.
Set the smoker for 225, I'm an hour in and the interior temp. Has only reached 200 degrees (my Smoke interior temp probe is clipped to the uppermost shelf). I'd have to get real lucky to get a real time response, but for the next time.... I'm assuming the mass of meat in the smoker is preventing the heat from getting to the upper portions of the smoker?
Not sure if I should bump the heat up, as I don't want to overcook the ribs at the bottom. Check at 4 1/2 hours and pull bottom ribs if done, and leave top ribs (and lower the shelves) to make sure they're cooked?