Volcanic fissure help

Ive been trying out Volcanic Fissure of Snaking.

My dmg seems to be really low and i cant figure out why.

Only thing i could find is:
- A warning in my POB that i dont have enough unreserved mana to cast my warcries.
- I dont seem to be taking any self damage in the "Skill type-specific stats"

My conclusion is that im somehow not exerting my attacks and i cant for the life of me understand why.

If somebody can see what i did wrong please do. Cheers

POB:

https://pobb.in/mCdO3gJBz5Nh

I could be wrong I'm working on my berserker build as well, and noticed the same issue and I believe you need the enlighten support gem at level 3 maybe 2 i dont know

Enlighten is primarily used to decrease the amount of reservation of linked skills. This effect is multiplicative with the effects of x% Increased Reservation Efficiency modifiers and the Socketed Skill Gems get a 90% Cost & Reservation Multiplier corrupted implicit modifier.

I stand to be corrected though i'm still noob.