cold boots are sometimes caused by them being wet,
try the following,
one pair of SKI socks, if your boots are supertight try an ultrathin/ultralight sock, eg smartwool ultralight, say no to cotton
If you have a regular overlap 2 piece boot ie; not a full tilt or dalbello, place tape over the toe dam, the rubber bit on the front of the boot. Alot of water can find its way in here.
Also take your liners out frequently to dry.
Dont store your boots in the car overnight, bring them inside.
Dont put boot liners directly or in very close proximity to a heater, this will melt/distort them.
If you need new liners because yours either stink, are packed out or mouldy consider buying intuition liners if the shells are still good.
Also for on hill ski edge bur removal, buy an Aluminum Oxide stone to remove them, cheaper and more abbrasive than a diamond stone and works better than a gummi stone.