Do you have the standard 510 or eGO? The only other solution would be low resistance atomizers. But those will almost certainly ruin a standard 510 battery.... I am sure they are hard on any battery as they draw a lot of power.... but many people use them with their eGO's.
As far as new PV, there is no PV outside of a mod that has more than a 3.7v battery. Is what it is - for now.
Edit: Last option, read up on passthrough's. If you have the right one, you can get 5v off a passthrough. I have never really determined if all PT's are 5v or not. It seems like some have said different things. I don't use them as i have an eGO.