i use double slotted mystic +6 for my 135 and i go to ft once in a while [every time i get a muster card]. for pvp, i use double slotted osmium +6. for me, mithril is still too expensive. so, i'm farming chaos lamps from nipperlugs with my almost dual trans 14 wiz.
When the going gets tough, they call on the sons of ******s.
mFS will fail in those dungeons no matter what you wear. Your cannons won't be able to break the defense of the bosses, and even if they will, you won't dps them fast enough. Anyways, this topic is about force bladers, not force shielders. FB is a squishy class, so we need all the defense we can get.