Something logical I think would be that hybrids could socialize with their "parent" species (Stegoceratops with Stegosaurus and Triceratops, Ankylodocus with Diplodocus and Ankylosaurus, Indominus and Spinoraptor with Velocirraptor...and even some T.rex/Indominus, Spinosaurus/Spinoraptor, Indominus/Indoraptor or Indoraptor/Velocirraptor socializing before they try to kill each other)
Or how about a raised in hatchery together perk that couples with the cross species gene. We see in modern parks bears, lions, and tigers together getting along. If you use the cross speciex gene and activate raise together as a hatchery upgrade those carnivores will get along with each other in the same enclosure. Same concept as getting a puppy and kitten at the same time, they will get along and be friends as they grow up together.