Our program at M.A.R.T. has always been based on fundamentals. The philosophy is that good skiing will make good racers through efficiency and economy of movement.
Early on our progressions were based on something simialer to Joubert's in Skiing an Art a Technique. Later, as PSIA adopted the Center Line, we used the Wedge turn with emphasis on the extension into the new turn quite a bit. This extension on the(soon to be/becoming the) new ski has been, and remains, a major focus in our teaching of fundamentals. Currently we teach it from a parallel stance followed by tipping the downhill ski into the new turn(as the Centerline Wedge does) This has been pretty much a natural evolution over the years but seems to be quite the vogue lately.
I received my "20 year" pin from PSIA this year and, for the first time, put it on my coaches jacket. I've been with USSCA(in it's various incarnations) for 25 years. We've always encouraged our coaches to get involved with PSIA. (Our first head coach, Eric Aserlind, was an examiner from Eastern) When the Centerline first came out it was pretty much what was being taught at the time(It was written by active coaches Mike Porter and Ellen Foster among others) I'm not so enamoured of the new Technical Manual. It's kind of nebulus and doesn't seem to have as direct a focus. It allows for creativity though, which is what good coaches and instructors have always done.
I"m reminded of what Eric Aserlind told me when he deciced to get a "real job" and took a battery of aptitude tests. "They said I was qualified to be a geologist(his degree) and a ski instuctor", he told me. "They have a catagory for ski instuctor?" I asked. "No, it's classed as a performing artist" was his answer. That was almost 25 years ago but it made a lasting impression on me.
USSCA has never been much on teaching a certain technique. Technique is always being evolved by the current crop of elite athletes. Their emphasis is more on identifying that technique and, through skills, allowing it to develop. Hence things like the B.A.S.E. test.
Wether it's teaching or coaching, there is no "how to manual". You have to take the basics and be "creative" about communicating to your athletes. The "fine tuning" has to be on an individual basis with each one.
Racing throws in the problem of Tactics. Often a racer's tactics can cause what appears to be a technique problem. Being able to separate them, then blend them again, can be quite a challenge. Watching WC racers isn't always the answer because they make mistakes and take risks in order to "win or burn".
Good luck, the "journey" is just beginning. It's a ton of fun.