There's been a lot of talk about different volts and HV atty's etc. I could be way off base here, but from my reading it sounds like the watts generated is what drives the vapor production. I've put together a spreadsheet showing the watts generated for regular 510 and 302 atty's vs. the HV atty's. The Joye 510 is 2.2 ohm and the 302 is 3.2 ohms (even verified this myself). The HV atty's for both 510 and 801's come in 4.5ohm and 5.2ohm (although I've only been able to find 4.5ohm atty's... I've only heard about the 5.2 ohm). Anyhow, thought this may help everyone see where you are and give you some ideas about about things and what the different combinations will give you before you try anything. You've all heard about people toasting atty's at high volts - it looks to me like you really start putting the atty at risk when you're over 15+ Watts.
Anyhow, if anyone finds any errors, shout it out. If there's some factor I missed, don't be shy.
AttyWatts.xls.zip
AttyWatts.xls.zip