I'm vaping mostly HHV liquids, in 60/40 config, might be a little more because I add some VG to stretch liquids (around 1/4 of the total volume). Whenever I load a light colored liquid it won't vape. Just a tiny column of vapor emerges, so much that I have to pump up the voltage and sometimes go all the way to 12 W on a 2.5 ohm head. So I'm sticking to darker colored eliquids, all HHV tobaccos vape great on the Protank. I'm dumbstruck.