[Chris Punsala]"From an AVDC pdf, they advised to change the format of the file in FCP."
That makes no sense, why would you change the format in FCP.
[Chris Punsala]""Choose “Field Dominance” and choose ‘Upper (odd)’ from context menu. NB: If this is not done, the movie might be exported with inverted fields.""
This is just flat not wrong. NTSC (720x480) is always lower first, always.
54.97? no such thing, but if you mean 59.94, that is the way HD states it, you do not want to be in HD anywhere. You are starting is SD, and ending with SD, HD should not be anywhere in your workflow.