I am a huge rookie too, and still stuck on 15 off, but noticed something that may have something to do with your turns. Maybe someone that is more skilled can comment on this too (or maybe its nothing).
I noticed you are not dropping a hand from the handle, I'm not sure if this was just the first pass trying to get the feel for the ski again, or if this is a norm, or if its a practice drill.
But it looks like instead of dropping a hand and allowing a bit of body rotation (don't know if that is the right term to describe it) to help initiate the turn you seem to be loading the tail to get the ski to turn. It looks like the tail of the ski is extremely loaded from once you make it around 1 till the boat wash.
Also take your initial cut out earlier, so you don't have to rush your gate pull. It looks like you gradually cut out off the wake, then increased your cut as you got further outside the wake, this is probably why there was more slack. Get where you want to be a little bit earlier and you can make sure there is no slack in your line before your pull thru the gates.
Again I am a rookie, so I really don't know what I'm talking about, but that's what I saw, as that is how I use to look. Maybe someone else can comment on that too, or maybe its nothing. Don't worry I'll join in the 15' off video segment shortly.
Oh and I don't know what speed you are at, but that SN wake looks amazing!