As far as I have been able to figure out, both juice and atty / carto matters. So does the battery.
Your best bet, if it's vapor you're after, is to try a juice with a higher amount of VG. Just be aware that you might still not be fully satisfied with that solution. VG produces a much thicker vapor but less TH than PG. That's the general rule. You win some and your lose some. Adding some PGA to the juice does give a stronger TH but I tried it and can't recommend it. It takes away a lot of the flavor and produces a burnt taste even on newly filled cartos. Less vapor too, so it's probably not for you.
To compensate for the lack of TH when adding VG to the mix you could switch to LR or dual coil cartos. That should leave you fully satisfied. Just make sure your battery can withstand the added current drain. Smaller (< 380 mAh) batteries are not recommended for LR cartos by most suppliers and might void your warranty. Batteries with higher/variable voltage (mods) will also produce more vapor and more TH, even with standard attys/cartos.
Disclaimer: I'm no expert. I just started vaping a couple of weeks ago and I'm still learning. You should get at least one second opinion, preferably from a more experienced vaper, before you go ahead and purchase more stuff.
EDIT: Vapor eyes er beat me to it...
