What you describe sounds like the TC intervening not spark plug issues.
Maybe all of the AWD guys should open a claim with Kia. Of enough people complain they may issue a bulletin to fix whatever is causing the issues.
I'm not that upset about it. It's still nauseatingly fast if you do it right.
I was under the impression that the launch control sequence disables traction control though. I have noticed that if any of the wheels slip badly when traction control is on the whole car loses power for what seems like forever.

