So that is taken into account as much as I feasibly can account for it. I had an (convoluted) equation I used to garner some kind of average for it. I'm looking back through older versions of the sheet, but I can't find how I arrived at the number. Anyway, if you look at the damage cell for each ability, you'll see an IF call for Electrical Blast, followed by the equation to apply the damage. The 41.67% is the number I came up with. That is then bounced against the mobs regen/recovery resistance then multiplied by the damage amount for static.
However! I'm looking at the sheet now because I28 Page 2 data is coming out and I'm working on updates. Looking at how the equation works, it's wrong. If you increase the mobs level, it increases the damage done. Clearly the opposite of what should be happening.
So I guess I'll be re-writing that formula since I have no idea how I arrived at the number to begin with and it's wrong anyway.