I'm constantly tweeking my techniques and trying to make little changes to get better. Lately my jumps have become smoother and cleaner than they have ever been in the past. Your approach to the wake is key, and varies depending on the trick you are trying to throw. If you are just focusing on pop and clearing the wake, this is might help:
This going to be a tricky one for me to try and verbalize....
When you cut out away from the wake and transition back in on a progressive heel side edge, focus on your orientation in respect to the wake and the boat. As your progressive edge increases, the "vector" of your board is relatively perpendicular to the path of the boat. Changing this angle of approach as you begin to ramp up the wake, will affect your jump. I find that if you aim your path/board towards the boat slightly just as you begin to ramp up, you will get a nice pop with enough momentum to clear your wake. This technique helped me to land wake to wake 360's because it helps your body maintain a nice axis in the air, plus it gives a little more slack in the rope so you're not getting ripped around while you're rotating.
My suggestion would be to play around with your approach until you find something comfortable that seems to be working.
Also, standard jump techniques would apply. Lock your hips and keep your core abdominal muscles flexed as your jumping... making your body solid. If you don't, your body will fold in the middle, absorbing the translational force and momentum that generates your jump.
ITS ALL ABOUT PHYSICS!
If anything I have said is incorrect, don't hesitate to call me out on it.... as I am in persuit of continual improvement myself! : )