Solve my dilemma

I am in act5 and have a rank4 4*corvus.
Shall I use him as he runs out of his charges sooner than I expected .
Also give me some tips.
Shall I use him as he runs out of his charges sooner than I expected .
Also give me some tips.
1
Comments
You can maximize damage and minimize charges used by performing this cycle: Medium-Light-Medium, Parry, Medium-Light-Medium, Parry... keep going until SP2 and make sure you drop SP2 while you have atleast one charge. This way you can get beyond 35 combo. Once you're out of charges, perform 5 hit combo-parry cycle. [BEWARE you are coldsnap immune only as long as you have charges]
Try and collect as many Persistent Charges as possible. They boost his crit damage by a lot.