Ahaaaa you beat me to it this time.
Because you have the Twist you'll be able to dial the voltage up according to the head that you have on it- comes with 1.8, 2.4 and 2.8 ohm heads. On a 3.7 V with a 1.8 I'm getting a great hit. If you're presently using dual coils you'll prolly also see better batt life. Here's a chart to help with ohms and voltage: