Replying to Liners?

ok so i got back from coc, and i had a great time but masssssive shinbang. i have fairly large feet (11) considering my size, i'm only 5' 8", and all skiers seem to have small feet. anyway, my boots (rossi exalt x 60, crappy i know, but fulltilts are $$) are size 29.5, so i should be able to buy size 29 liners, they'll fit in the shell, i'll get some improvement in the shinbang department, and if my feet grow at all i can just swap back in the old liners. is buying good new liners, probably heat moldable intuitions a good idea? i'm also assuming i should go to a bootfitter to make sure the new liners fit correctly. any suggestions on models of liners and such, or should i just save up 300 bucks and buy some fulltilts?