I use a Twisted Messes 1 with the airflow closed to 1, dual 26ga 2.4/2.5mm contact coil 6 wraps. I get great flavor out of it or going to 24ga and 7 wraps. Those of course are 4.2v builds, I don't do series really, other than on a noisy cricket 2 but have the voltage turned down below 6v and still use the above builds.
I've found (to me) anything below the .3 range gets too warm if I'm looking for flavor. In all the attys I've bought one thing remains, if the atty wasn't designed for flavor, it's rarely going to give any. I think the only reason those exotic
coils help is due more to chamber reduction than heat.
I can get more flavor out of an igo-w with regular .5
coils than I can with a Velocity and .25 (or lower) exotic
coils. Not saying you can't get flavor out of a Velocity, it's just the larger the chamber the less the flavor (usually). Now it also depends on the liquid used as well, some just don't bring the flavor as much as others.
I'd work on simple coils spaced or contact and play around with diameter sizes and placement. For flavor I prefer to push the coils out towards the afc, others go closer to the posts. Basically start with reducing airflow, that should get you going in the right direction.