Have you checkt the Arducopter tuning videos of Chris Rosser? Finally someone talks normal language on tuning with Ardupilot for FPV.
That configurator is great to batch FC with your tunings. But to really tune your quad and understand what the settings are doing. Chris Rosser is your best source at the moment.
I have, although I didn’t see this issue discussed. I’ve seen a few other videos of log debugging that hint at how you would recognize this problem, like this