By the way, other update in the performers:
I'm currently working in the performers list for Istoria~Kalliope~ (it's a true nightmare...) and I've found quite a few repeats. Among them, I got the reading for 山下未歩: it's Miho Yamashita, according to this:
zhongtiqin.island.ac/players/yamashita_miho.html
EDIT: Ack, seems I was pretty late. A lot of research on the unromanized artists on this album already took place here...
http://vgmdb.net/forums/showthread.php?t=9139