My apologies, Ruth. I tend to write in acronyms or nicknames every once in a while, without thinking.
The so-called S-class ships are Statendam and her sisters (or very near sisters), which are all approximately 55K tons with passenger capacity between 1200-1300. These are Statendam, Maasdam, Ryndam, and Veendam.
R-class includes the slightly larger Rotterdam, Volendam, Zaandam, and Amsterdam -- approximately 60K and 1300-1400 pax.
As an aside, HAL also has a Vista class, consisting of Zuiderdam, Oosterdam, Noordam, and Westerdam, which are about 80K tons and hold about 1900. These are the ones that tend to attract more families, from what I hear.
I can't imagine anyone tiring of your company. But, I do know what you mean.
You may be able to request table changes, particularly if your cruise is one that is offered in segments.