After a gruesome week of grinding for the 21 stars, Gold, DCs and Calliopes got everything done and most of my core units awakened(a whopping 7 Awakenings today melted all the SCs I had left). I can say I'm content now and can focus on slow steady leveling of characters now.
http://i.imgur.com/BRoV9yK.jpg
ps. Thanks to lolix and Tenhou for the tips.