Love the "gate denial" concept...
Watched a couple videos of myself from a few years ago and I could not believe how narrow I was on my gate.
I agree that speed change in a major variable. I think this gets lost on those who are skiing max speed all the time.
4 Things I've done to help breakthrough the 15off wall..
I dropped my 30mph pass in practice and started doubling up on 32 and 34mph.
I bought a progressor rope from In-Tow and and started running "18off".
I run some 18 and 22off at both 32 and 34mph.
I bought the Ski-Doc and started using the wakeye app to video myself - holy cow - why didn't I get this years ago!?
As an aside...
My son skied 28, 30, 32, 34/15, 34/22 this year. After Regionals we dropped 15 off and went 28, 30, 32, 34/22.