Corrupting cry build help

Hello community.

I have a lvl 93 Kitava Smith that uses corrupting cry. I can quicly stack it to 10 stacks in 2-3 sec.
With all the dmg amplifiers in the tree and around 1k Strength i deal 2,6k dps per stack while being very tanky thanks to kitava.

At max stack I reach 26k dps and I have like 45% more Strength, thats why I reach 1k strengh.

But after using every support and passive to increase my damage, I am stuck.

Yes i can kill everything because I am kinda immortal but bosses take around 100 seconds atm as the have around 2,5million life.

The only increase I can see is an astra with around 100 stats but even then i can max go for around 35k-40k dps while LS abuser do millions with one button...

Is there a way to increase my damage with corrupting cry, or is it the limit on this patch and we need new support gems and uniques?