Thanks you’re welcome.
Why don’t you get 5x Strength Nature and 1x epic Crit DMG%?
Crit DMG% cap is 350%, so you only need additional 125% - a second crystal slot would give you 125% more than you need.
In case you have Epiphany (5) you could do that though. You’d need to calculate that according to the CRITav formula in my other guide:
I’m to lazy for that right now ;). But I’m pretty sure in terms of DPS the second Weaken is better than a second Crit DMG% even with Epiphany.