Your gear looks fine for the most part and mana management will get better with time. I did notice the lack of use of Holy light on several fights. It's not the strongest heal out there, but it's incredibly efficient during times of low damage. Might help until you get yourself stabilized.
EF is still the go-to talent for Tier 3, but mastery wouldn't be a bad idea to go into based on your comp and other things. It can also help with your mana.