This is exactly what I've run into working with foam liners over 20 years (Conformable, Head and Surefoot). The cuff bladder area doesn't go up as high as I want it to and really doesn't expand enough to get me where I want to be. And at least these three companies provide a fixed amount of foam so you are kind of stuck. And yes, compared to the stock liners and certainly my new Zip Fits they are not very warm. See if the Zips will work for you; I have the World Cup model which has even less volume than the Grand Prix and they still have a lot of material and support around the lower leg/calf. With a competent fitter you will be able to tell in the shop without having to commit to it. Check out their web site if you haven't already; the fitting process has its nuances but I will never go back to foam.
I had Langes. The first set were in a pair of WC140LF foams that I bought at the beginning of a season. The foaming worked well, and filled up all the obvious voids. The shells cracked in a little over a year, and Lange replaced them with a WC130LF foam, same year as the original pair, but apparently some of the liquid for the foaming had leaked or evaporated out of the bottles provided, so the foam didn't occupy as much of the voids, or provide as snug a fit as the first pair.
Seems to me a good boot fitter would have his own bulk supply of the 2-part foaming chemicals, and would be familiar with the proper amount of each to inject into a given bladder, but maybe the chemicals and volumes necessary vary too much from manufacturer to manufacturer to make this feasible? Anyway, I never thought I'd get as good a fit as I had in that set of WC140's, but then discovered intuition and dalbello, and have never looked back.
PS. The KR2 has two mounting positions for the ladder portion of the buckle on the upper cuff to accommodate skinny calves, and the instep cable has a second cut-out in the lower shell (under the cuff) to effectively shorten the cable, and accommodate lower insteps. Also, see my earlier post about the intuition powerwrap, or powerwrap plus for a warmer, lighter alternative to foam. (also potentially less messy)
Funny. No, they don't have bulk chemicals. Good thing too. How many hazmat sites do we need?
It is an issue though - age of chemicals and also sometimes they just don't expand right.
The water based Boot Doctor foams which are softer are supposed to be more reliable and less toxic.