Pointe shoe prob! dancers plz help!?

okay so i have super super flat feet and im on pointe. i have to get the softest shank in my pointe shoes so i can actually go over on them, but my foot is soo strong that brand new pointe shoes are dead in just about two weeks.if i get a harder shank than i wont b able to go over on them. but if i keep them, itll bruise my toenails. i use european balance and the white toe pads with gel on one side and fabric on another (forgot what theyre called). do u think i should change pointes? or what can i do cause its a really big money waster to get pointe shoes twice a month?