On my DNA 250C mod I used a .5ohm gt ccell locked at .52ohm with a ss316 TC profile. Temp was set to 395f at 22watts.
Priming the coil with raw distillate is the hardest part. Fill with warm distillate, block the air holes on the bottom and lightly inhale. You are trying to make any air bubbles move and saturate the cotton and ceramic core.
One thing to note about the cotton and ceramic core. I noticed that when I used distillate with terps, by the time I finished two tanks the cotton and core were discolored. Not charred, but not looking very pretty either, somewhat brown.
Using raw distillate without terps gave different results though. I could run the same amount through with the same settings and the ceramic core and cotton came out looking pretty much brand new.
This was with cannabis derived terpenes at a rate of 4%