Did a couple quick mods yesterday that seem to work well. Bottom vents are pretty much useless and unneeded on this model. Vents were very loose fitting and heat was escaping from them. I took them off and bent the adjusting tabs all the way over and put them back on backwards and it sealed them up tight. The water pan is also too large. I cut the front and back edges off with a sawsall. Heat seems to be reaching the smoke chamber much better. I am also running sand in the water pan. Have the unit running on very low and holding 235-250. should be using much less gas.