Replying to Ski boot for low volume feet and tinny legs

Have about a 97-98 last but low volume feet especially around the heel area where my heel dosnt stay down for butters and stuff, tiny legs so I was thinking the intuition wrap liners. DONT HAVE A BOOT FITTER NEAR ME. Help! Kinda want a 3 piece construction with intuition liners...thinking full tilt dropkick or krypton 110 or roxa element 110, any others? Could go 2 piece ...any shell molds or boots that are good , how do you determine flex too? I’m 120 pounds if that matters...thanks!