I currently am using an Igo with a 808 to 510 adapter. I use Boge LR cartos on it, and it vapes AWESOME! However, the problem I'm having is that when the Igo is fully charged, the voltage is to high and the cartos will not fire until the battery drains off a bit. I have to do a strange dance to keep the charge high, but not too high. Boge SR 510s are too weak for me as well. I don't like 3.7, because the TH and vapor is just a little to weak for me. I tried an ICON from puresmoker, but the 3.7 just isn't working for me. I guess my question is, where to I start looking to find something in my wheelhouse? 4.2v 510 mod?