At 3.7v with a 1.5 ohm 306 you would max out the Twist's amperage load at 2.46 amps, but it would be in range. Any higher on the voltage and you'd get into setback mode and the voltage would drop. 1.7 and 2.0 ohm 306 dripper attys would be better for battery life.
3.7v with any of the above 306 attys would be a good vape and you'd be in range. Stick in the 1.5 to 2.0 range at 3.7v and you will be fine. With the 2 ohm, you'd be at 2.4 amps at 4.8v. That's still in range.
At 2 ohms on my Provari, I'm usually in the 3.4v to 3.8v range to suit my taste and the juice I vape. I'm more into creating the amount of vapor I got from a cigarette on the exhale. Any more is overkill, IMO. Others opinions may vary. If I go out and need to stealth vape, I don't want to have to fan clouds over my table, so I got used to reality in the amount of vapor I'm happy with.
I've stuck at 24mg juice for two years. Huge clouds of vaper means more nic in my system and I can feel the dizzy coming on. If I drop in nic considerably, I might be a cloud seeker, too.