Brad:
May I ask how did you add a second vent? My WSM runs cold, no doubt, and my last two attempts at "high-heat" brisket have been more like "medium-heat." I've tried propping the door as recommended, and while it's helped get the temps up somewhat, didn't really do the trick. I only tried Brayn's lid skewed method once, but that was only inadvertently, and I freaked when I saw the temp hit 450, and closed all the vents to bring it down. With the wife and kids and all, I find the longer cooks somewhat impracticable right now, and am trying to master the higher-heat-for-shorter-times methods. A second vent sounds pretty cool...