Could not help you much on Tank RDA's, whole different ballgame due to the complexity of tanks.I am however curious about rebuildables
I'm at: high ohm ,MTL, low watt vaping Magma/Origen V3 deep well RDA's. Maximum taste and minimum e-liquid (I DIY) consumption, and this seems to be my sweet spot. The deep well and settings above give a good 45 min. to hour vape without re filling. Virtually next to nothing costs on wire and new rayon wick. Coiling wire is as easy as it gets.