tl;dr so I hope this isn't a repeat but...
Are you bearing off (going downwind) a little first, too?
Ever been on a trampoline or a diving board? Think of your load n' pop as jumping like that - you gotta load up the trampoline and wait for it to sag, then spring back before using your legs to increase your boing.
Steps...
riding with the kite parked at 10 = standing on the trampoline
bear off a little = first jump up into the air
edge upwind = sinking into the tramp
release your edge = springing up when the tramp starts to rebound
That last step's timing will depend on your board, your kite, your body etc - it's something you have to get a feel for.
As others pointed out, sounds like you're digging into your edge too long - like landing on a tramp with your knees bent like a gorilla and refusing to straighten them using them to bounce...
Also I think don't watch wake style vids - unless that's what you're planning on doing... it's my opinion that they load up harder and longer than regular folk need to for popping jumps, doubling little waves

etc.