Well, my advice to you is keep cold at 60. That way you can have 80 heuksal, and 80 bicheon, and 80 light.
The cold mana shield is still effective at level 60.
Have you thought about the 90 cap?
300 masteries at level 90....
So your build would have to include 90 lightning. Leaving 210 points.
To keep up with others u will need cold at least at level 70, 80 would be better. So thats 90 light and 80 cold. Leaving 130 left.
One weapon mastery should be at 90. Preferably bicheon because of the latest level of the knockdown (to keep the 50% chance of knockdown).
So far, 90 bicheon, 90 lightning, 80 cold. Leaving 40 mastery's left. with those 40 masteries, you could just have 40 heuksal. But what good can that do? Fanning spear maybe.
But what i suggest is go 30 fire for the status shield so you can become ice immune. 30 fire, 90 light, 90 bich, 80 cold. Leaving 10 left.
Just get cold up to 90.
The sensible thing to do is keep it simple. Dual weapon doesn't work at 90 cap. To be effective, weapon skills need to be maxed and u cant have 2 weapon trees because u need 2 force trees as an INT player.