In January I'm planning on getting some new ski boots to replace my Head S8s. The liners have packed out somewhat, but I've come to realise that overall they're too roomy for me anyway. When I do a shell fit, there looks to be about 3/4" of space (I haven't got a correct size dowel to hand to make sure, but I improvised), so they're a little more of a 'comfort fit' than I would ideally like. More importantly, though, they have a 100mm last (or, more accurately, a 103mm last reduced to 100mm) with an internal frame - and I have quite a narrow foot, meaning that to get control I need to crank down the buckles a lot, and I get bad foot cramps in the first runs of the morning probably as a result of this. So, I'm going to bite the bullet and get some new boots in a slightly smaller size, with a narrower last.
BUT...I'm actually getting 3 days of skiing in between Xmas and New Year, and I don't have time to get boots sorted before then. So, I'm looking for ways of taking up some of the volume in my existing boots (which I otherwise like) to kludge me through that short break. I've already added a shim beneath the footbed; a DIY equivalent of the Eliminator tongue shim using neoprene and contact adhesive; and a little shim using the wonder combination of neoprene and duct tape in the achilles tendon area (outside of my liner) to hold my heel in place a bit better. These have all benefited, but I still have the unwanted space around my midfoot/forefoot.
Now, I was thinking that as there is a removable internal frame which takes the last width down from 103mm down to 100mm, maybe I could beef it up a bit and lose another 3-4mm, taking me down to a much more svelte 96-97mm? I'm thinking of a few layers of a PVC tape on all the surfaces. But I probably need to lose some volume in the heel area as well. Should I add something on the liner, or inside the shell? And is what I am trying to do feasible at all? Or am I mad? Any thoughts on the subject are welcome.