Just explain why the fallback is so good for the crew and bad for CX. I am on a fleet that does not get much benefit from 543. All I can see is no requests and loads more reserve.
CX imposed RP01 and they will manage fine with it for 4 years and then all they need is the FTL's to work with after that expires.
RP04 has its limitations however I am with the President on this one, a review and an extension in an attempt to resolve the area of concern is a logical way to go.
I have not seen many constructive comments on what is wrong with RP04 and what would you do to improve it. I would start with a proper credit for leave that would only mean half a months work in a month of half a months work