I used the VTC4 and the one I got with my Milaana(green), I push them more since I get 5-7 bowls/battery, for the last bowls coil start to glow around the +10s mark, while fresh it's around 8-9s.
I get 6-8 hits per bowl, I start to draw at 7-9s (it depends the battery strength) and draw for a...