for SVJ, IMO - the oly full squat + supra max half squat together with the actual jumping drills is hard to beat for its simplicity and overall direct carry over to the jump.
you do not sit back on a jump. u bend your knees, do an explosive reversal like your life depended on it.. then boom. fly. no need for serious STIM or mental preparation. u only think of 2 things.. bend knees.. get to your sweet spot at the bottom and reverse the shit out of it.
if lance / adarqui told me this before, i would have been dunking a lot earlier.

and about the wasted reps. i use some pauses between reps to recover at bit while using as much moderate-heavy rep i could possibly use because in order for me to make sure im putting all effort in the lift, the weight has to be heavy enough - if i dont push with all effort - I WILL GET PINNED.. thats a good way to look at it. somthing like a 88-89% x 4-5 reps while eating cows/salmons.