Bass muting with a gruv gear fret wrap? 

I hear a slight difference but have some suggestions to improve the experiment. If you’re looking for an example that might show a more obvious difference, I recommend using round wound strings. Rounds have a lot higher presence overtone frequencies compared to flats. The muting at the nut dampens sympathetic resonance and unwanted overtones caused by vibration between your fretted note and the nut. Give rounds a shot and maybe try a DI recording for more clarity for your audience. Like your videos :)

Couldn't stand the weather!

There’s a shorter decay but not as much as you would with a Nordy or other bridge mute

Hard to tell. I want to say yes. But it’s also quite difficult to tell if my brain is making something up.

I heard no difference, but I think that’s because you have good left hand technique to begin with

Nope, no difference whatsoever.