Huh.... Very Useful.

Diagnostics

#1 - So eliminate anything causing excess vibration.

A bolt appears to have sheared off the engine mount where the mount connects to the cradle. - That's interesting.
So fixing that could be a priority.

Engine is under load - it's bouncing around, and that could be screaming misfire...
If this was a misfire for real, I should feel it correct? The steering wheel vibrates, the car makes sounds, sputters and all that right?

This car does not.

It could be a vibration issue.
Examine the belt connecting to the alternator and all that stuff. - that looks possible. Probably due anyways, and probably cheap.