I don't believe it was the RAPAC's back then that caused the boundaries to go back on the charts, but a push from some other sectors of industry, including ASA/ATC.
Certainly in the southern states the push originated from RAPAC i.e. NSW, VIC/TAS SA and WA to restore the boundaries on charts and their minutes at the time reflected that. ASA & ATC were interested parties but were not pushing the matter.
The RAPACs were all most vocal against the NASIG towards the end, with the perception that changes weren't being consulted and RAPACs just informed what was going to happen. One of the parties involved didn't win any friends when he said at a meeting "the time for consultation is over".
In fact a search for NASIG, NAS etc. on this forum turns up much info from the time. Couple of examples (note in the first mention of the FIA boundaries at the end of para 6):
http://www.pprune.org/australia-new-...ml#post1074840
http://www.pprune.org/pacific-genera...ml#post1019849