AST mana problems.

[Aphel]

A fresh level 60 AST will always have this problem, no matter what cards or how awesome your combo is. The 60 dungeons are made for ilvl 150~160.

Once you've geared up and your mana shoots past 12k it won't be so much of a problem.

[Blaon]

Although I never use that card on myself because it's more useful to monks with greased lightning or others, if you are having that much trouble with MP, you could use the CD reduction card on yourself, then use the MP refresh skill, and then the stun / 5 second extension skill (the lvl 60 one). This way, you will recover the skill faster, and it will last 5 more seconds, which is probably just 1 or 2 more ticks.

Sorry, my memory is too bad to remember the names of skills. :P But that combo would help you with your MP issues.

You can also try to get some gear with Piety to have some extra mana.