Old post but worth replying to.
We do much the same except no marinade.
Cut the fillets across the grain in 1/4"-1/2" strips then cut out anything white.
Buttermilk, batter in doctored up flour (seasoned to taste)
buttermilk again, flour again.
Fry in fish cooker in the driveway at minimum of 350 degrees and no more than 375.
With side dishes a full breast will feed 6-8 adults with plenty of leftovers.
We used to use House Autry cajun batter but prefer the double battered flour.