Swingbeep, nobody is ever going to accuse you of lacking technical input! With that degree of tech info, ???
I will do my puny best.
I disagree with the views of the compression of orthotics. I have had my pair for over 20 years. Out of interest, I verniered the heel thickness, and this has not changed. I think if they are of the gel type, this would not be true.
OTOH, 25/30mm shell space!!!!
Oh, I never gave any thought to the liners on my Reichle, which I wore for over 150 weeks of skiing.... Until I snapped the connector, they were as good as new.