What is the biscuit test you ask? Well first, you buy a few cans of the cheapest biscuits you can find in the refrigerated section of your grocery store.
Then, you bring them home and fire your smoker up to whatever temperature you like. I used 300 F for this test. Then, you spread the biscuits out evenly on your smoker racks and let them bake. As they brown, you can determine where the hot spots are in your smoker.
Now, if you will excuse me, I have to go rotate my butts.