One thing I do is simply to remove all flac tags except for those I actively set/use. I run this against every file:
Code:
metaflac --show-tag DATE --show-tag TITLE --show-tag GENRE --show-tag ARTIST --show-tag ALBUM --show-tag TRACKNUMBER --show-tag DISCNUMBER "$1" | metaflac --remove-all-tags --import-tags-from=- "$1"