I just tried a Kayfun Lite with a 1 ohm coil on my SVD and ran it up to 15 watts. It seemed to work ok, but I was almost getting what seemed to be a "burnt" taste. I had to back the wattage down to around 11 watts for it to taste ok. I put the same Kayfun Lite on my Poldiac V2 and the taste was perfect. I checked the voltage drop on the Poldiac with this tank and with a slightly used battery, it was reading 3.9 volts. With that resistance (1 ohm) and that voltage(3.9 volts) the wattage output is 15.21.
What is causing this difference between regulated and mechanic mods???? It seems that the mechanical mod's straight DC voltage can deliver a higher wattage without getting the coil too hot. I have experienced this before.