There's only 3 things I personally feel need to happen to SCH for it to be perfect in my eyes.

Succor needs to get the same benefits for crits as Adlo
Emergency Tactics needs to cut the cost of Adlo/Succor in half
Dissipation needs to grant a free, instant Fairy summon.

Some buffs for Selene wouldn't hurt either but I can take it or leave it at this point.