First of all, you have the right to request copies of all those paperwork that is filled out by the employers. Request it!

Second of all, is there a reason you cannot go back to the CFI position that you just resigned from ? FBOs are looking for CFIs, regionals are looking for pilot.

Thirdly, apply everywhere. Regionals are hiring. If you cannot get a job in a regional right now, that means there is serious issues. (not being profficient, not goog attitude, etc. etc. )

Lastly, think twice about getting into heated conversation with your boss (Chief FI). Most of the time they are more experienced than you and there are certain thigs to bring it up, do it tactfully.

My $0.01