My second attempt at sealing the lid went much better. I got some 3/8" fuel line and cut it down the center lengthwise and put it on the bottom of the smoking chamber. Not a perfect seal by far, I had to leave the hinge area alone. I would say I went from 50% of the smoke leaking out the lid and 50% going out the stack to around 90% out the stack. I'm using less fuel than usual, but it is a lot warmer out today as well. Here's a pic showing most of the smoke out the stack.