hands in blasting position, then slide back hand a little further back ,stand up straight to pop of the chop, you need to use your legs to pop on flat water, pop, look back, front arm straight rear arm sheeting in to you are eating your boom, tuck rear leg up to land to reduce backslap, if you keep getting back slapped you're going too slow and you're not popping off the chop, or you're heading upwind too much to jump
looking at your photo you need to straighten the front arm, sheet in more with the back arm, puch sail a little further forward, then you are well on your way to destroying your boards,