First of all, are you sure the coils you're using are TC compatible (ie made of SS,Ni or Ti)
2nd the coefficient shouldn't get messed with it goes with the resistance of the wire you're using so unless you're absolutely sure of what you're doing don't mess with it.
Considering your tank seems to get very hot from what you're telling, i'm guessing you're messing around with settings you probably shouldn't. Stay in power mode and you should be fine (although heat will always be present at higher wattages)