Some good news, this is my trick with the highest completion/attempt ratio.
My first attempt i glanced down at the water and threw half an s-bend, landing on my back still extended.
Cut to a year later, and i gave it another attempt, being sure to watch the passenger riding shotgun. I've landed every other one. (with the exception of my blown out knee [ but i still landed it])
Sounds to me as if your hauling ass into the wake, and make sure you look at the boat, you've got it set.