Ok here is my take. I am at the same level skiing as you 34 mph 35 off but this year is the year I think I learned proper stack. The last couple times out I have ran multiple 35’s and they have felt perfect.
In your free skiing set your cuts on what would be ball 2-5,8,&10-12 you don’t rush the turn and you get your shoulders back and hips forward , great leverage, proper stack.
In your course video you only do that on ball 4 and you have more time coming into ball 5 than any other time in the course. All other turns it looks like you are rushing the turns.
Again I am at your same level but those shoulders back and hips up makes the runs feel great. If you start getting slack into and around the ball don’t pull so long. I will come through the course getting slack and realize I am pulling to long and it all comes back together. All the work is done from half way from the wake to the second wake.