I have had a go at building my subtank rba deck today, coil is the one that comes supplied and reads at 0.5 ohm. However I can't seem to use it at more than 18w vapour is really hot and I'm getting dry hits from anything above 4 second draw, anyone know why this is happening? With the 0.5ohm occ coils I can use it at 25w easily without it getting warm in the slightest. any help would be appreciated