Zo
Is So So

1817 is = 1636+1998/2

That's how Wartotem's SS calculates average damage.

By using just 1998 you're only calculating top end

Figured this would be better than me clogging up the Revenge thread, don't want to derail it and have it locked. I think you forgot to modify the formula for damage to be the same as the PTR. (which is relevant as were talking about the future damage)

base damage = 1817+0.31*Stats!C10, Average damage = =((E5-E6)*E7+E6*E8)*1.6

Should be something more along the lines of:

base damage = 1998+0.31*Stats!C10, Average damage = =((E5-E6)*E7+E6*E8)*1.6

I only changed the 1817 to 1998 as I'm not using the spreadsheet you are and unsure as to what further changes would do to the outcome. Make sure you're factoring in the 60% damage increase from talents (up from the current 20%) otherwise you wouldn't get the 50% damage cleave to begin with.