Total damage increase, post big bang

I wanted to make a thread to see how much the end multiplier for an AM is after the big bang patch is. I'll use my AM's stats to calculate it.

INT: 669

LUK: 138

MA: 172

I don't have CL maxed, but I do here.

(4*669+138)*172/100=4840*7.2=34,849 without any boosts

Now factoring in magic mastery, which is +30% MA:

172*1.3=224

Amp increases the skill damage:

720%*1.6=1152%

So now it's

(4*669+138)*224/100=6303*11.52=72611

The elemental weapon boost is applied to the final damage(correct me if I'm wrong):

72611*1.25=90764

And the total boost to damage post big bang is:

90764/34849=2.6

I figured it was this, but I wanted to be sure that it is.