The only two coasters at KI with bad capacity are Firehawk and Invertigo.
Everything else was running very well whenever I went this summer.
Crypt, Flight of Fear, Son of Beast, any of these ring a bell?
SOB runs at the best capacity it possibly could with two trains....Not once have I seen them stack full trains. IMO, FOF isn't that bad. I give the best crew award to either BLSC or Beast.