Stack is probably one of the worst words in waterskiing.
Alignment would be a better word. Alignment is dynamic and we can always be pushing to be aligned. Stacked is static. Not much static actually happening in real-time behind the boat.
From this thread:
https://www.ballofspray.com/forum#/discussion/comment/393015
Easy fix.
Some guys "Squat and Pull" meaning they bend their knees, drop their ass back and pull across the boat with bent arms. They'll never own any real buoys. There has been thread after thread on here and videos of guys skiing that way. incorrectly.
Other batch of guys "Pull but kinda lean". They roll the ski on a nice edge, their shoulders are pulled back 1 notch but their arms are bent and they are "pulling" themselves across the boat. That's you.
Therefore you are "arm skiing" the entire pass versus using your legs and ski as a pendulum. The arms should be part of the connection, not the system making things happen. You are artificially swinging versus using the energy of the boat. Owning 35' will be near impossible at 36 using your arms.
Freeze frame Nate, Freddie, Will etc. at the first spray and through centerline. Just focus on their arms. Now do the same.
You'll see their arms are straight so the load is transferred into their lower half, thus creating swing energy.
Until you change your approach of your arms, you'll be putting a band-aid on a broken leg.
Then again:
https://www.ballofspray.com/forum#/discussion/comment/392538
Watching your videos and then your previous post, the issue is not "get your butt up" but it's your fundamental thinking of what position you are supposed to be in. All these coaches are telling you the facts but your mind is fighting it and refusing to commit/believe/comprehend/over come objections. You can have another 15 people tell you the same thing, it's not going to help.
The issue is your core fundamental theory of skiing is built incorrectly on "squatting and pulling" versus "leaning with your frame".
Both of these posts are the reason the bell curve exists in waterskiing with 4@32 being the meat of the curve.