I use the Herakles with my eleaf 50w and usually use the .5 coils at 25-33 w depending on what juice I'm using...idk if that's the correct way or not but it works great for me. Anything lower and I feel like I don't get enough vapor anything higher the vapor gets a little warm and I'm not usually a fan of that. I have it at 29.5 w right now with half High Rollers Dueces Wild & half Five Pawns Gambit (idk the vg/pg of those two,don't have the bottles in front of me right now) I don't know if the wattage and the juice have anything to do with anything but I've found that some of em I like at higher wattages than others.