4 volts would cook and fry my juice for sure I use 4.5 v on a 3 ohm coil and 3.7 or under for 2.5 ohm coil if I increase I get burnt taste.
Once you burn on a coil, you may not even be able to get rid of the burnt taste with a good cleaning.
You need to figure out WHY you're getting that burn in the first place - you shouldn't, but it may actually be WORSE with lower resistance.
I found that I would get "dry hits" and then burning on a ProTank because not enough juice got to the coil. I fixed this by pulling the air stem off the coil/head, and with tweezers, removing about 1/2 of the wick that lies across the top. Look for "remove flavor wick on ProTank" here or on YouTube to see exactly how to do this. Now I'm happy with my ProTanks...
(and I use 2 ohm coils at 4 volts all the time).
