My own personal experience is that effectively using frontside/backside heavy requires a lot of things to be right. In my own skiing, what allowed me to finally access the tail of the ski was a couple of things. First, it was getting the boot setup right. I needed less forward lean and a gas pedal on the boot. Second, it was about rotational alignment. When Ann Schorling gave me permission to allow the hip to move in the turn, all of a sudden I was able to feel connected to the outside foot. That gave me the ability to move forward and aft on that ski.
On Friday, I had another session with my coach. I actually scored a 147 on Carv with a perfect 100 on the balance metric, and measure of both using the tip and tail of the ski as well as the roll of the foot into the new turn. However, I've had issues with too much tip lead, particularly on the right footed turn, and that was leading to some issues in correctly accessing angulation. So, off we went to work on getting the tip lead and excessive counter out of my turns.
So much has been said about separation. I think I took separation way too far. I no longer like the term, as when I think I'm getting the skis to perform, that is when there is rotational alignment in my body, I don't feel separation between the upper and lower body; I feel connection. There's a strong pull between my hip and my lower leg. I'm driving the leg around my body; and it comes back under me.
As I've been learning this new position on the skis, my balance and edging scores dropped (an objective measure of ski performance). But they've started to recover. Today, my best run scored 144. Hopefully that's not because I reverted to my old movement pattern -- I don't think I did, but I don't have video to assess it.
Why this story? Because managing fore/aft pressure is a skill to be acquired and used at every level of skiing, from the beginner to the expert. As we learn new motor patterns to access new levels of skill, some of our other skills may be impacted. We need to go back and work on those. Improvement is not linear -- a change in performance on one skill may very well diminish performance on another. So realize that all of the skills are applicable at each level, but moving to more advanced levels will require revisiting skills that once had greater levels of performance.
Mike