Dual catch cans work on B58. Single does not. If you decide to dismantle your intake, you will find oil contamination in both the PCV and CCV hoses. Anyone on the forum can confirm this for themselves in an hour of work.
You have 3 choices:
1) Get the valves walnut blasted every ~40K.
2) Run CCV+PCV catch can.
3) Run port injection to bathe the backside of the valves.
Ideally, all three. Can skip #1 after port injection.
All of the above is true of any GDI car, Supra or otherwise.
You have a built engine and port injection to target 540 wheel horsepower? Is this a troll post. ?
But reducing spark gap is usually the wrong answer, unless you're running really high boost and alcohol fuels. People make this mistake often, as there's a lot of bro science and bad advice out...
What's your spark gap, what plugs, what's your boost target, and what AFR are you seeing in these moments?
At first blush, this sounds like spark blowout. Gap is wrong, plug wrong heat level, coil boots might benefit from dielectric grease.