I find my best flavor comes from a continuous MTLTN, mouth-to-lung-to-nose. I learned to do this when I would power smoke a cig to get a bigger nic hit at times. This is not my usual vaping style (I'm a modwomper and proud of it) but I do come back to this technique from time to time because the flavor is so good - giving the inhale and exhale flavors all at once.
Step-by-step
1. Draw vapor into mouth only
2. inhale vapor through the mouth, continue drawing vapor into your mouth
3. repeat 2 or 3 times, until there is a good amount of vapor in the lungs
4. begin exhaling vapor through your nose as your continue to draw/inhale vapor into your mouth
5. continue to your heart's content
(ETA: Had to try it to make sure I wrote it right. I also noticed I take my finger off the power during my inhales)
once you get it going its you're basically just breathing
ETA: I can only handle this with restricted MTL airflow settings and cooler temps