https://i.ibb.co/Sd01qmQ/20150602-135907.jpg
first photo is the burner, 3/4" pipe, 2nd photo link shows copper pipe off bottom of burner where damper/fan fits. Fitting on vent is my old fan connection used before I got damper.
here's what I use on my WSM 22.5
B=0; P=4; I=0.02; D=5
Fan pulse; min 0%; max 30%; max at startup
Servo 700 - 2110
top vent is always wide open
My burner uses 3/4" copper pipe
I never go by temp alone, it's done when you can stick a bbq fork or something similar in and when you pull it out there is no resistance or meat holding the fork. like a hot knife into and out of butter.