I actually set my baseline differently. Not that your way is incorrect or anything.
I would build/wick my coil, DNA device set to my profile (SS316L in my case), fire the atomizer until it hits temp control, quickly remove the atomizer from the mod and reattach it, press the fire button, press "up" for new coil.
Now I know for a fact that the coil reading is wrong and way to high in resistance. I leave the setup alone for 5-10mins. This forces the DNA to re calibrate base line cold ohms.
The reason I do this is because sometimes when you thread down a tank to a mod, some mods tend to grab the first initial coil resistance reading. In some case the first initial coil resistance reading is when the tank is half threaded down and the contacts are not 100%.
This may have a variance in resistance of +/- 0.005ohms. This may not seem like a lot but in temp control and depending on how high\low your resistance is, it could be a deal breaker.