My Astrologian is just 51, but I use my cards mostly like this:

4-man dungeons:

Balance & Arrow : Spread

Spear & Ewer : Shuffle

Spire & Bole : Royal Road

My main goal is to get Spire / Bole for the Royal Road and then to use Arrow / Balance for a group-buff. I don't know if this is the way to go at 60 but I thought this would be the best way to use cards.