Yea that was kind of an old post but at some point later on I actually switched from umbral to the CD aspect with my Ice Shards sorc because I got to a point where I had like infinite mana against groups of mobs but had mana issues on bosses if I got an unlucky streak of no procs, so the CD aspect ended up being more useful later on.
I figured out perfect mana management at 60 using paragon boards. Maybe get ghuud i dunno.
Did you notice cooldowns went to hell too?