As far as I *know* it's perfectly safe to vape stainless steel in wattage mode. So, if the Ka setting (good to know, I guess) is the one that is wattage only, you can use that, matching your watts to your 0.43 coil.
It's also fine to vape your coil in TC mode, if it's stainless steel. You could experiment and see which vape you preferred....
Anna