Sorry about the delay in getting to the rest of my thesis about the idea of leveraging/leaning into the front of the boot....
Just too many people, meetings and not nearly enough hours that I can keep my eyes open in a given day...
So- to pick up where I left off- I set the basic parameters of the stance issues and why. To reiterate, the intent of the skier will greatly dictate the variations of technique that will be affectively used.
Let's take a look at a skier who's intent is to make high performance(carved) short radius turns. If we pick up on the skier as the transition is about to be made from one turn to the next, the legs are generally getting shorter/flexing, managing/absorbing the pressure/energy being generated by the speed and radius of a carving ski(Cp). If this energy is allowed to become to great, it will not allow the skier to make the transition smoothly.
As the forward movement of the skiers core becomes aligned with the desired direction of the next turn, the legs are relaxed. This allows the core to be drawn across the skis(harnessing Cf), into the new turn.
The transfer of dominance from one ski to the other occurs during this phase. This transference can be passive or very active, depending upon the desired outcome of the turn.(The shorter the turn, the more active and sooner this must be)
As the core is taking a shorter line through the turn than the skis, it starts getting slightly ahead of the feet during the early phase of the turn. This might be viewed as increasing the pressure on the front of the boot, but in fact, the increase in pressure to the tongue is minimal. Most of the pressure will be towards the sides of the boot.
During this phase, the skis are tipped to their new edges, and the legs begin to lengthen/extend in order to maintain adequate pressure/energy between the ski and snow.
The skis begin to carve into the falline and a relative state of similar speed is established between the core and the skis. As the carving of the ski occurs, that arc begins to redirect the core into it's new path. An dramatic increase in pressure/energy is realized as this redirection begins to move away from the fallline and across the natural pull of the hill.
Once again, the skiers legs begin to shorten/flex to manage/absorb the pressure/energy being generated by the speed and radius of a carving ski(Cp).
Now let's look at some of the variables which may occur with this description.
Beginning with intent, let's suppose the skier wishes to tighten the arc of the turn. The primary changes to be made are a higher edge angle of the skis on the snow. This is effected by increasing the amount of pressure on the boot- not so much forward, but more toward the 9-10 and 2-3 o'clock positions. The skier would also adjust the balance point forward, maybe as much as 3/4" to 1". This will be enough to bend the forebody of the ski, without over loading the boot and possibly allowing the hips to get too far forward.
The basic movements and refined timing remain generally the same.
Should the skier wish to lengthen the turn, these movements and timings might be subtley delayed/retarded, without the change in fore/aft balance, and be more passive.
What would happen if the boot tongue was loaded up during any particular phase of the turn? Likely, the ski tip would overload and the tail would run the very great risk of washing out, and/or chattering. The same result would probably occur if any rotary movement were instigated prior to positive edge engagement. These two, individually or together, are common deficiencies in many recreational skiers.
How does the ski design affect this scenario? If the ski were unbalanced, (soft tip, stiffer tail)any excessive loading of the tip through tongue loading of the boot would again result in excessive hooking of the tip. This can be controlled to some extent, but too much results in a decceleration of the ski, causing the core to move forward of the feet if not contained. At this point, the legs/hip joint will begin to lose it's mobility. This results in a loss of accuracy during the transition and control, until such a time as the leg is unlocked again.
On the other hand, if the ski tip were stiffer, the skier would have to exert greater than normal pressure on the ski tip throughout the turn, in order to get it to carve the desired arc. Once again, this will most likely result in a balance position forward of that desired, and that required to maintain mobility and accuracy.
When balanced accurately during a turn, right on the sweet spot, you may find that there seems to be very little pressure being exerted on the front 1/3 of the ski(the SLOW part of the ski). Though photos often show what appears to be the tip hooking up and bending mightily, due to the width and flexibility of that part of the ski, it takes very little pressure to achieve that result.
Far more critical is how much the skier can bend the midbody and tail of the ski (the FAST part of the ski). By the way- if you happen to find that the back 1/3 of the foot falls right in the middle of the fast part of the ski, would you think it coincidence? I think NOT!
I hope I have made myself clear enough to be understood. I'll have to check back in the morning to see if any of this makes sense!