I might be wrong here... Kinda in same perdicament. But, IMO, based on playing with Steam engine. Using 1ohm or higher and 20 watts or less as starting point. 29 or 30 would be better for single coils, both of theses can bee used for coils covering the Isticks limitations. 28 is great IF you are building between .7 and 1.5 ohms, beyond that it is just really slow to fire or too many/few wraps.