when i was learning to ski (shortline) and was going to horton lakes, dr horton used to always tell me to "pull thru both wakes". this would help me get wide and early but also helped me "seek" or "develop" a strong position thru the wakes... so I could "pull thru both wakes" (not alot of people say pull anymore fyi)
a good shock absorber does not bounce, it actually exerts quite a bit of force in return
for the last couple years Ive been going for hips out as far as possible, shoulders back, chest out from start to finish, from once im up to when i drop to shorten, thru the wakes I attempt to PIN my elbows to my vest with arms straight, bent arms thru the wakes makes me crash
this spring i was warming up with a little freeskiing, and i just happened upon this crazy position thru the wakes that is hard for me to describe; once the ski is pointed across course I "fall" back or lean away from the boat, with my hips up, arms straight, shoulders back i was finding this super-leveraged position that could not be disrupted by any wake. felt like i was arching my back a little more? i picked up on it by watching video of john travers and austin abel, i took this position to the course and it was sick
so my humble advice is to find the position, practice it on dryland with a rope and a tree, try a few turns and crossings outside the course, and the only other thing i can think of is a freeski drill where my coach used to make me pull (no one says this anymore) as far out to the side of the boat as humanly possible and stay there, forces skier to hold the same position needed to blast thru wakes.
good luck, dont you ski with some dude that gets into 39? he should be able to help too