When I start my coals, I use a coffee can with holes put in it with about 6-10 charcoal lumps in it. (I dont have one of those lovely starters most use.) Then when they are going good, I add them to the center of my fire basket in the Pro-Q, assemble the smoker and open the vents until the coals get going in the smoker and temps get to where I want them. At this point, I notice that if I have a full basket of charcoal, temps keep going to 300. So instead of a full basket, I only fill the charcoal to about half a basket. This keeps my temps down to about 225 as the high. If I want higher, I will add more to the fire. Since I have not yet used the waterpan, I have not seen the benifits of use yet. I thought that was mostly used for adding moisture to the food. From what I hear, its a big temp control device too..? So I will be adding water to my pan when temps rise? This is an entirely new concept for me to grasp. Seeing as I use the UDS for most of my applications, I have never used one of these new fangled gadgets.... lol
I never use water in the PROQ or the WSM...
...so you leave the vents open until you reach the desired temps?
I usually start to close my vents at around 190-200 degrees (top therm. in the eyelet) because I like to smoke around 230-245. If you leave the vents open until the smoker reaches smoking temps my guess would be, yea the temps would get our of hand...need to start the cutting the air before the temps get where you want them. You can always ad more air for more heat but as you already know its difficult to get it back down.
But on a side note adding fully lit coals to the smoker to keep the temps where you want them is just fine...I am pretty sure thats what the wsm instructions say...it just wont stay at temps without a lot of adding coals.