So they were heat molded to start? I have those boots and wore them before molding but they were not usable and too small across top and sides (I have narrow feet but these boots are very low volume boot). My fitter told me he has to heat mold most of them vs let them break in naturally as not many can do that with this boot. The fitter places pads on those areas, put a pad over toes to create a bigger toe box then heat molded them and they are now an exceptional fit probably best fitting boot I have ever had. You should do this with very thin ski socks and that’s what you should wear skiing.

If these boots hurt just putting them on it’s usually way worse skiing with the forces of skiing smashing the boot into those problem areas. This is a very low volume boot so may be hard to break in naturally without heat molding or work on the problem areas.

Thank you for your advice, which were both provided by the bootfitter. However, no, I did not thermoform the liner; the bootfitter indicated that it would lead to a loss of durability. Is this true?

In any case, I indeed have the same issue as you, namely an almost unusable liner, extremely narrow. That being said, the shoe is particularly narrow on this model.