First thanks to the forum and those of you who take the time to answer our questions.
I'll start with observations then questions.
This season (season is now over) working at my local ski school the CSIA level 4 is observing back seat position - while I can probably explain away the issue with the reocurrance of a lingering lower back injury and while I have made some improvements one of the off season goals is back flexability and core strength improvements.
With the position observation I had descided to explore on my own if boot alignment was in the ball park (I have always wondered this). Reading SouthernSki article - Balance in Skiing is Critical and the section on boots in Ultimate Skiing (McMaster) I look at the diagram A3 (optimal forward leen @ Southern Ski) and using the self test from Ultimate Skiing
I find that with the femers level and maintaining the leg 'centered' within the boot cuff that my center of mass is more over the heel than balanced on mid foot.
The boots are Tecnica Mach 1's (120) (2014's), fitted & punched where needed, custom footbeds, heaters. While not perfect (specially when cold temps are happening) ( I have high instep and high arch, this area is always room for improvement) buckle 1, 2 are never clamped down, 3&4 are used in conjunction with a Booster Strap around the tongue.
My calf at boot top is around 12.75" and I use the 'standard' spoiler that comes with the boot. And I have good range of motion in the ankle.
I will assume for the moment that I am somewhat correct that by observing a center of mass over the heel I may find an improvement by making the effort to adjusting in a bit of forward lean.
While my ability of lower back flexabilty will influence this I am wondering the following..
I can and will experiment (off season) with redoing the test with a series of 'spoilers' of varied thickness to see how much I could/should add to bring balance to 'center'.
a concern that I have is ..
1) by adding spoilers does this not mean that the liner looses contact with the shell and the result that the heel and top where the spoiler is are the only contact points?
2) assuming that I can determine some sort of optimum spoiler - what would be suggested to a material to use? should this be tappered top to bottom so that it extends down towards the heel more that a 'standard' spoiler? Or should the spoiler be only say 3" long for example?
3) at some point, I'm assuming again, by adding spoiler you are now decreasing rangle of motion in the ankle. Is the fore/aft alignment better to be acomplished by modifing the boot sole or lifting the heel piece of the binding? (Skiis are Head iRace w freeflex pro14's)
Am I on the correct path or am I wasting my time?
Thanks for taking the time to read.