Im having good success with the 0.8ohm improved dual coils, vaping juices on the higher PG side at around 28 watts. The hotter coil and faster wicking juice seem to help flavor. I run a closed off airflow and do mouth-to-lung, so I'm sure the vacuum generated helps wicking as well.
The improved housings arent too bad to rebuild, though they tend to favor vertical coils, where the PT2 style are easier for horizontal. Switching from the Kanger silica to cotton helps flavor, and the 28ga wire is a little more robust vs Kanger's 32ga. The trade off is when you dry hit a stock Kanger, you can get it back to normal...dry hit a rebuilt with cotton and it's back to the "to be rebuilt" bin.
Honestly if you're after flavor, and arent nic addicted where you need your vape with you all day, just go RDA on a VW mod. I have yet to try a cleaomizer or RTA that gets me flavor like my Veritas.