This is going to be a long winded post but I love those ones. This thread inspired me to do some of my own 'bootfitting' and even though it is ill advised. However I'm pretty comfortable with simple experimentation. So I took it into my own hands to make a pretty decent fitting pair of boots, fit really well. Pictures are worth 1000 words, so I just use them:
On the workbench, 2011 Dalbello Voodoo:
Last season I had troubles with getting some calf strains from a few backseat/knucklers when the wind was uphill, bad idea. My calfs/shins felt a little loose at the top, so taking from OP's idea of using cork, I did! I had some good stuff laying around, and its super workable. Here is the spoiler shims:
In doing so I found out I could lengthen my spoilers for more support. So I did! Feels way better:
Next thing was that my boots felt a little wide and slightly too long towards the end of the season unless I maxed out my buckles. Definatley the liner packing out. So once again, I used cork to shim underneath my stock footbeds (thinking I should maybe get some new ones at some point...) and wow, what a difference a 1/16th of an inch shim can make. Boots feel way tighter all around, and still fit my feet really good. Nothing feels weird under the footbed, and I'm hoping the cork will take up some landing shock!
After way more templates than the two shown up there, I cut one out shim out and fit it in the boot and it was a pristine fit:
Then I put in the stocker footbed, and it fit in the boot cleanly with no weird bumps or raised edges from the cork shim, had a super nice firm fit:
And then I tried them on and like I said, huge difference, feels way tighter, and my calfs don't feel like their being meathammered by the spoiler of the boot! Definatley worth your time if you have the skills and confidence to try a little of your own R&D. I will do my best to report back on the ride of the boot now, and then once more on the durability of the cork!