I'm a fairly recent convert to cartomizers, and after reading through the forums and experimenting a bit, I now get much better performance out of them. The throat hit and taste were never an issue, as the cartomizers are great for that, but it really took a bit of messing with to get the vapor I wanted out of it.
First, you'll never get great vapor from a prefilled carto right off the bat. However, once you refill it with a
juice that contains some VG, you'll notice a marked improvement. I haven't used blank cartos yet, but I would imagine the vapor production would be on par with a refilled carto.
Second, cartomizers like higher voltage. You'll see a vast improvement on vapor with a 5v or 6v battery mod. I recommend 5v, as 6v can be a little too much for some flavored juices. At the very least, I would advise a good 3.7v mod, as they have a little more "oomph" in the battery department than a standard e-cig battery.
As far as the adapter is concerned... you may want to try another adapter (maybe from another vendor?). I'm using a 510/KR8 adapter from AltSmoke, and had to plug one of the holes, and now the draw is perfect for me.