Don't put iLv90 Requirement to the Fight, if you expect a win.
This only says people have the gear. Set the iLevel lower, but watch your group, detect the person who keeps 'messing up' and tell him to try another time.
(Dont tell them in a rude way, but if you are building a clear group, tell them you expect the knowledge of the fight).
After my first clear as mnk I startet doing Titan Extreme with my sch but far less iLv and since then i always got my weekly clear as sch (First clear als scholar was with iLv72, i also helped out but i refuse if people set insane iLv requirements).
