It's a gain thing.....................when I set the cameras, either the Hero 7 or Hero 8 to "Standard" mic, the loud popping Geiger counter static is greatly reduced at a wind speed of 20 mph or for any loud noise for that matter. When the gain on either camera is set to "Standard +", which is a 20 db gain, any loudish noise will result in the Geiger counter loud popping static. This is the same for 2 different microphones tried in combination on both Hero 7 and Hero 8 cameras.
So the audio amplifier does not deal with loud inputs that saturate the audio amp chain at all well.
The "Standard" setting, albeit, not as loud as I'd like, provides a more reasonable result that I might be able to work with when used on the outside of a moving vehicle with additional wind reduction from foam or dead cat covers. I'll do some test drives this morning.