QUOTE(AppleShop @ Jun 21 2015, 08:58 AM)
Yes you have to use Nickel. Quick science reason : Current Temp Control chips calculate your temperature by measuring the resistance of the wire you use as it heats up. Kanthal is engineered to not change resistance much as it heats up so it's very inaccurate to measure the temp this way. Nickel's resistance changes at a uniform measurable rate when it gets hotter so the chips can accurately (to a certain degree) estimate the coil's temperature.
Also, Nickel is a non-resistance wire (meaning the base resistance of the wire is very low compared to Kanthal). Achieving even 0.5ohm's on a nickel build is very difficult as your coil will have way too many wraps to fit in your RDA / RTA. Ni200 builds aim for the below 0.2 ohm range.
Don't ask about watt recommendation when using temperature control, it's the just the amount of power you supply to you coil to hit the temperature you set. More power = faster to hit the temp you set and then the wattage will fluctuate as the chip trys to maintain your coil at that temp.
Instead, ask about the recommended Temp to fire at. And to answer your question, depending on the juice, I usually fire between 370 - 420 degrees Fahrenheit. This one is up to your taste, hotter temps generally result in less flavor, more vapor and warmer vapes.
Good luck, have fun!