I have liked 0.15 ohm ~ 60 watt the best, but I have tried to build my own coils and have ended up with surpisingly high resistance, 0.89 ohm. It seems to like around 20-30 watts, but there is not much vapor or taste, and it takes a while to heat up. I am on 'pwr' setting on the mod, but I can change, but have no idea whats best. Any recommendations?