I have the Istick 50 with a Nautilus tank. 1.7 ohm coil. What would be the highest watt useage recommend for this set up? I read the user manual for the tank and didn't see a max safe watt. I don't want a melt down. I did however notice that once I get above 18 or 19 watts the flavor of the juice starts to diminish. is this something that could be rectified with a different type of coil in the tank that would allow for higher wattage and give a better taste. Or a different mix of juice?