^^-- I thought I said that, while explaining the how My Batt Hurts' idea is partially implements it but not enough.
There's actually 2 ways to do VW, one is measure the resistance before or at the beginning of the hit, calculate the voltage to apply, and hold it through the whole hit. The other is to constantly measure resistance and if it changes, vary the voltage immediately even if mid-hit. If that is how the power limit is applied in TC, this results in the voltage increasing as the coil resistance increases, until the protect threshold is reached and then the voltage drops sharply. Or, TC can also be done using the first method, that would be my choice and probably how most do it. Of course, the difference is insignificant with SS, and Ni and Ti are moot as far as I'm concerned. But it is still interesting.