Please, Calibrate your dome thermometer, if you don't know how, ask.
There are many ways to reach any given temperature and any method is fine. I tend to use the lower vent for course temperature control and the DFMT to fine tune the final temperature.
Hopefully the following will give new users a head start in learning to control and stabilize their egg.
The following are settings on my Large. The setting for my medium, small and mini settings will vary somewhat.
A stable clean burn can be seen by looking at the dome pictures below. You want a clear or light blue smoke coming out of the egg.
265° Using 1/16” open lower vent
315° Using 1/16” open lower vent
The following have a larger lower vent opening
I need to open the lower vent to go higher. 450°