5.5 volts is way to high for em. i use that tank on 3 holes open. but you can fully open it if you want. i use wattage not volts but i can check and see what volts i use. i run it around 10.5/11 watts with 3 holes open haven't run into a problem yet. i was running into the same issues your having with it getting way to hot/not working at lower volts. i switched over to wattage mode on all my vv/vw mods. you should be fine around 4.0. try a new coil tho you might have smoked that one at 5.5. im not an expert these are just things ive picked up in my 2-4 months of vaping.
also are you using the old style or new style kanger heads?
also are you using the old style or new style kanger heads?
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