I agree that 6-8 is the ideal size table for socializing. DH always goes to dinner a tad early and deliberately changes where he is sitting so that we have to mix it up. Sometimes I'm right behind him, but usually I just refuse to rush to anything on board.
We will sometimes select a table in the same server's section but aren't too picky. The table size will change each night depending on who we end up dining with. If our dining companions have a favorite waiter, we will usually defer and let them choose the location.
"Carpe diem quam minimum credula postero"
Seven Seas Explorer - Miami - Venice - Mar 2017
Silverseas Explorer - Arctic - Aug 2017
Seven Seas Voyager - Rome to Beijing - Oct 2017
Seven Seas Mariner - Lima to Buenos Aires - Jan 2018
Silverseas Explorer - Siberia - Jul 2018
Seven Seas Mariner - Australia Circumnavigation - Dec 2018