I have this problem too, and I haven't found a real solution. I have observed that multiple species help the show's rating, and no animal should perform any trick more than once. I have a show in which a beluga, two dolphins, two sealions and two short-finned pilot whales perform. I edit the show frequently and yet I cannot raise it above 3½ stars. I have considered adding an orca, just to see if this high-ranked animal will do something for my show rating.