The review in the other thread (Almost crashed with Black Cube (first flight) - #13 by Marc_Dornan) has the answers.
Really, really bad vibrations. I’m seeing a delta of over 70units for AccelZ when you were briefly in flight. I’m seeing delta of 10units or less for my AccelZ before I had really nailed down prop balancing/etc on my Solo.
Shit, when I flew my Solo into a backstop at a baseball field I only got detla of 88units for AccelZ 