Heya everyone I struggle with fire mechanics also... after reading your thread and hearing people’s processes I’m a little confused now.
On my 22.5 wsm I usually have a fire ring of unlit coals over ~2x2” wood chunks. Almost a whole 18lb bag... and I evenly spread out half a chimney of lit briqs and I start with the bottom vents 1/2 open until the internal temp reaches about 175-185. Then I drop the B vents to 30% open. Top exhaust 100% open. Once it starts reaching 245-250 (about 45 minutes to an hour)I close the top exhaust a little bit to maintain and get a thinner smoke. if I’m not careful the coals will all catch fire and it will be very hot and rising rapidly.
How is everyone leaving everything open until 230 ish??
When I run my 22" WSM, I'm using the "jelly doughnut method", where I fill the charcoal ring all the way, then I remove the charcoal from the center where the jelly goes, and put it in a chimney, light it up and dump the hot jelly back in the middle of the doughnut. I've had good luck with this method. When I want to run 225, I use less hot jelly, when I want to run hotter or need to overcome some cool windy weather, I use more hot jelly.
The other way to run the jelly doughnut is to put one or more lighter cubes or tumble weeds in the top layer, center of charcoal, and light your coals like that rather than using the chimney. In this method, you leave the barrel of the cooker and lid off to the side until you're satisfied that you have the right amount of lit coals going, then you put the barrel and lid on and start messing with the vents. No chance of dropping any hot coals this way.... It is also a little bit more fun in my opinion to standard around and have a beer and just watch the coals burn.
Fiddling with the vents; I run the lid vent wide open and then start closing the bottom vents all the way, one at a time when I get about 75 to 50F from set point. When the first of 3 bottom vents are closed I watch the temp to see how fast it's climbing, for about 3 to 5 minutes. If after a few minutes it's still climbing fast, I totally shut the 2nd vent and keep watching the rate of change. Of course if you totally shut off the air you could put out part of your fire and make it hard to get it going again so be careful if you start to close that last bottom vent.
Based on my experience, The jelly doughnut technique may be a little more consistent in terms of controlling ignition rates of the unlit coals vs minion method of scattering lit coals on top.... If you happen to have a Vortex, you can use that to create the hole in your doughnut. Just have a nice long set of channel locks handy to grab it and yank it out.
Most importantly, IMO, running at a precise temperature is not as important as other factors such as using good smoke wood, good seasoning, not peeking too much, and etc.. I am not scared to run a little hot, if you over shoot the set point, you still want to close vents one at a time and not over correct. Worst thing that happens is you're done a little faster and you put the meat in a insulated cooler or warm oven for a while before dinner time.
Good luck!