Well, I try lots of stuff, but I always end up going back to my Prodigy V3. And the V2, actually. Those are my #1 and #2.
My gripe is with the darn HV cartomizers. I have tried several brands and several configs (510, 801, 808, 901) but most of them seem to clog up long before they die. And boiling them out hasn't worked. I have just resigned myself to using them for a few days and tossing them.
I ordered some of that new type that is supposed to have a ceramic bowl instead of the fluff inside, but I don't think they shipped what I ordered, because I was supposed to inject liquid into two little holes. Trouble is... they didn't *have* the two little holes, so I ended up dripping into them just like regular ones. And they're leaky.
Anyway, what I do best with is my V3 at 6volts with the HV cartomizers from Drew, or else my V2, which comes in more like 5 volts, also with those same cartomizers. (You can also use the V3 at 3.7 volts if you buy the alternate battery, and then use the LV cartomizers or atomizers, and I do that sometimes, too. Especially if I am out of the house, because then my battery lasts longer.)
Does this help?