RCCL hit S17 the two times Ive been on EOS. Carnival/Princess no.
Hitting of S17 and the 8 deck shoes really cranks up the odds in favor of the casino.
See here
http://www.qfit.com/blackjack-odds-calculator.htm
The odds go from -0.207% to -0.424% just by the dealer hitting S17 on an 8 deck shoe, which is what cruise ships commonly use.
There is a sliver of hope. There may be a single deck game on your ship. If so exploit it.
As far as changes in BS for dealers hitting S17 there is none that I know of. Contemporary BS has been honed down on super computers over the last fews years to a point where there is a basic generic one that is pretty much used for all situations/playing conditions. The % advantage gained by situation specific BS is almost microscopic and would be unoticable.
R