Help with MC X2 Wake Pictures

My son is trying to surf. He cant drop the rope without falling off the back of the wave. Not sure if it boat set up, board or his technique. I have a 2010 Master Craft X2. I had factory back tank full and fly high sack on top full, KGB in floor full and bow bag filled. Trim tab down, three adults in boat and two kids most on port side. Any suggestions on how to make wake better would be appreciated. He usually rides a Liquid Force Fish 5'3"

Thanks!