the are many types of flowerhorns and they're not all hybrids from the same species. the only species you can count on to be in most flowerhorns is the trimac, though I'm not so sure the trimac was used to create all the kamfas. it is possible though, but the kamfas usually look less like a trimac and more like a red devil/midas.
the flowerhorns with intense pearls could have been crossed with a red terror or more likely a carpintis. the FH's with a lot of pearling and blue lines on the face surely have carpintis in them.
FH's that get huge humps most likely have midas and/or synspilum in them as these 2 usually get very large humps (sexually active males anyway).
FH's that get a really intense red color on the head region most likely have a lot of synspilum in them. synspilums (good quality ones anyway) have a very intense red coloration all over their head (hence the common name of Red head or Firehead cichlid). a blood parrot or red devil could also be used to bring out the coloration, however the problem with this theory is the normal color of a blood parrot or red devil is usually orange and not red. most flowerhorns that are bred for color are usually bred to bring out intense reds and not oranges which is why I think synspilum is more likely.