Arthur, let me be frank.
You shot yourself in the foot in this one.
None of your arguments hold water.
Your 'partial engine failure' was completely pilot induced by letting a non-certificated passenger entrusted to your skills manipulate the controls in such a way that it created a problem.
If this would have ended in an off airport landing and I was FAA I'd be going after your ticket full force.
Oil got into places where it shouldn't have been and that's why it ran like sh*t.
Then the fuel thing ( roll eyes).
Seriously go take a look at yourself.
I'd go back and apologize and ask for my job back is what I'd do.