The most you'd have to do is just simply up the percentages of the flavors in the mix. Start with .05% increases, and go up from there. I myself, began on regular cartomizers, then moved up to single coil
tank/carto combos, then dual coil, then dual coil with variable voltage, then vv, with a viv nova, and WHOA...
There's a good amount of difference, BUT if you draw hard enough there shouldn't be too much of one.
What I suggest, is when you DO pull off the carto, whether it's in a tank, or not, pull about twice as hard as you normally would, and see if that helps the flavor any. getting more air in there will push more molecules around, and hopefully do what you're looking for. If not, I'd start ticking up the percentages of your flavors by .05% every round, let it steep fora day, and see how it comes out in your carto.
But, that's my opinion, others may have found better methods.