Hi Boris - Thanks so much for the details at that you are mentioning, we are so fortunate that you and others are able to help memories stay bright and shiny!
It wouldn't be at all surprising that the use of RMS was 'in vogue' - specially when QE2 was given "first place in the queue" in and out of ports, and when captains were referring to her in public announcements. Seem to remember this was done definitely in a sort of highlighted tone...