OK so I think I have made a really nice TFR/CSV file for the Crown SS Coils, everything else I have used or made has been to week or just hasn't really worked the way I felt it should on my DNA200 and I know its been an issue for many people. Try this in Steam Engine to create the csv file and let me what you think. 24 gauge - SS 304 - parallel - 8 wraps and a inner coil dimension of 6 mm, I left the wrap spacing at 0.5 and the leg length at 5mm. I'm running this at around 260 degrees C with 60 watts cheers Rustdust Edit: I forgot to mention that this was based on a 0.5 ohm crown coil that I dismantled and it would be reasonable to assume that the 0.25 ohm coil would be less wraps.