Hi all I'm using a gas smoker from Lowe's - the Perfect Flame, which looks just like the BB GOSM, at least from the outside. I'm pretty happy with the unit, done a few cooks already. But I'm wondering about putting a sheet of rigid rock-wool around the outside of the cabinet for insulation. I'm a little surprised I need to keep the burner so high just to keep 250 degrees in there, and this is with an air temp of 70. I've kept the lower side vents closed and have the top about half closed and I'm using very few wood chips. I put hot water in the water pan. I'm using a second candy thermometer through the top vent to verify temps. I've got some minor leakage around the door and I plan to put some silicone gasket material to help seal that Any ideas? Reflectix insulation is rated only to 180F, but rigid fiberglass and rockwool are 450+ rated.