I know the game is already done and etc, but has the PS3 version had the file management fixed up so it can save with less file size?
Sorry, but that's not possible. The saves gets larger and larger the more you explore and play, as it saves everything. All "chests" that are emptied, all the junk that is moved around, the locations of all the NPCs and so on. If the size fo the save was cut down, it wouldn't save all your progress any longer, which would make it a worthless save.