i had exactly the same and had a whole thread trying to fix it
Unfortunately all videos are gone but i can assure you it was exactly the same. I need to read the thread again as i don’t remember what ended up “fixing” it.
I was also using Meepo 100mm hubs on a Unity. (which i still use but without that “cogging”)
The typical question: Duty cycle is set at 95%?
What is your Duty cycle current limit start set at?
Does it also happen while riding?