Right. In my experience, I don't really pay attention to FLKC events on WOT pulls. It's feedback correction in response to knock, and that's what I look for on anything at high load.
Looking at the two logs, you have one event at ~5200 RPM and another at ~4200 RPM which makes me think it's not something harmonic (like a heat shield) and more likely real knock.
If it were my tune, I'd be inclined to pull timing to correct for this. Also if you haven't had your injectors cleaned, that could help too.