my builds 80 pacheon 80 force 70 lightning 40 fire 30 ice
I agree if you're not gonna take force to 80, don't even bother with it.
The vital spots too weak, your decay would only be lvl 6, and your AR reduce vital spot would be pretty low. It would be a waste of 60 mastery lvls.
And youd be missing out on the last 2 vital spots [the last 3 are what makes force worth getting].