For more vapor, go with higher volts, and lower resistance. Or max volts with higher resistance. I suggest trying the lower resistance first. For some reason, lower resistance coils seem to be more readily available. You get some 1.5-1.8 coil heads, start your volts out around 3.6, and increase slowly until you get a satisfying vape. If you crank it right to high you might burn your coil. Not pleasant. Or it might not even fire. It's been too long since I used an Ego Twist to recall what max volt for lower resistance cut off is. Sorry. There might not even be one. I'm really not sure. But I do know if you go too high in volts, with too low a resistance coil, and it lets you fire, that's not going to be fun for you.