Hi guys, been a long time...
Let's see where to begin?... Since you are discussing the frontal plane I will focus on that but to truly balance your equipment we need to consider and adjust angles on all the planes sagittal, frontal, transverse.
On the frontal plane there are 4 different adjustments and these should be assessed and adjusted in a chronological order beginning with the foot/ankle then working up and out of the boot.
The first assessment looks at the foot and ankle using the footboard/zeppa and footbed/orthotic to support the foot in a neutral position. I watched one of the youtube videos above about using exercises to develop a neutral stance. My thoughts on this are, it is possible but it takes time. My suggestion to my clients is to adjust their alignment now for where they are then reassess each year to readjust for any changes they may have. Why wait and hope? Get it dialed now and enjoy your ski season optimizing your performance now! The goal with adjusting the bootboard and building a footbed is to support the foot in a sub talor joint neutral or to create a vertical heel cord. Another consideration is to adjust for other foot abnormalities that may exist as well so the foot is comfortable and supported in a soft neutral permitting the foot to still invert and evert.
The next step is to then assess the cuff angle to "accomodate" the lower leg curvature. ideally the cuff angle should match the lower leg angle creating equal space on either side of leg and boot cuff. Changing the cuff angle to correct or move the knee positioning is not ideal.
The next step is to assess the sole canting by lining the center of the knee mass where desired. This is not one spot fixes all positioning and takes a skilled assessment of joint congruency and biomechanics understanding. The adjustment is then made to the soles of the boots or under the binding. This has a totally different affect than making internal boot adjustments! Internal adjustments affect mostly the ankle while external adjustments affect knee positioning without changing the foot/ankle area.
Lastly, the fourth area to consider is ski base cant angle as it also affects edge engagement. You will find as the first three adjustments are refined the need for excessive base bevel negated (if over canted).
To short cut this process and focus only in one area is missing the mark and will yield less than optimal results. Those who poo poo boot balancing are sadly missing an opportunity to improve skiing performance as very very few are optimized in their stock equipment. I assess 10 parameters in properly aligning a skier the four above are just for the frontal plane. There are four more on the sagittal plane and two on the transverse plane which can be optimized to improve skiing performance.
Don't miss the opportunity to improve your skiing performance the fastest and easiest way. Though improving technique/tactics, improving physical conditioning, and improving the psychological state will all contribute to optimum skiing performance, removing the impediments caused by equipment are without a doubt the fastest way to improve your skiing performance.
ps JayT, I read your post and I suspect their may be a possible forefoot issue which could be adjusted to solve your issues? I am in Reno if you would like me to take a look and will be skiing frequently at Northstar this Winter?