John, I often shut down the two “windward” vents completely during a smoke, and barely cracking the “leeward” one. Actually killing the heat completely isn’t going to happen in five minutes. Don’t worry, it will be fine.
I do not chase the ten degree window like a teenager at the prom. Make adjustments one at a time, wait twenty minutes re adjust. I like the windward ones open about the gap of the thickness of a bamboo skewer or less unless I need to kick things up which WILL happen. I try to work more to a 25 degree variable, much more realistic and causes less hair loss (something which seriously concerns me!) and makes the cook more enjoyable.
I know, you’re working on a new piece of equipment which you need to get used to but, once you see just how easy it can be, you will get into doing a ton more projects!
Relax, sit back and crack a beer! Or something relaxing.