Doubtful you injured yourself, though I'm no doctor. And yes, you corrected an issue with tc by locking resistance. There's different settings depending on the mod and its actual operation but tc needs a few things. First you need tc capable wire (ss like you have, nickel/ni200, titanium). Pulse a bit in wattage mode to make sure the hotspots are worked out and it's glowing even. In tc mode there's almost always a way to set power in either wattage or joules, that's the power the mod will use to heat the coils. Then there's the temp limit you've set that will cap the power. Think of it like a car, if you set the cruise control at 65mph but the engine's only pushing 5hp it's going to be a long day getting up to that 65mph limit you set. And vice versa, if you're only trying to go 5mph, applying 500hp is going to be awkward as well. So there's finding balance with the two.
The other is locking resistance. You need to figure out how it's done for your particular mod/chipset and it needs to be done when the coil is cool, room temp. So even though stainless is either wattage or tc, don't try locking resistance after taking a couple rips off it in wattage mode. Let it get to room temp, then lock the resistance. Otherwise as stainless heats the resistance fluctuates wildly and the mod has no chance of applying the appropriate power. Also if possible, make sure to choose the proper coil type or set the tcr. Some mods will simply say temp mode, 'ss, ni or ti'. So you choose 'ss' because it's stainless steel. Which stainless though? Some mods may have the preset stainless for ss304 or ss316 and you're using ss316L maybe. They're not the same and have different tcr's. Setting tcr manually if you have the option is a good idea just in case, unless you're using ss316L and the mod specifies SS mode is for ss316L.
A handy tcr resource here.
https://www.djlsbvapes.com/different-wires/
I think now you realize you need to lock resistance you'll have a better more consistent experience.
Another thing that might be of interest and may improve the tc experience, arctic fox custom firmware. Gives your mod new options if you don't have it installed.
https://nfeteam.org/