And another thing.
There are no health numbers on the enemies (if someone hasn't noticed). There are either "health circles" or verbal descriptions like "wounded", "badly wounded" and so on. I checked it myself.
So even if in the combat log it is written "271 damage" it might be a lie as well. At this moment we have no way to confirm that when the combat log registers 27 damage to a Babau this particular Babau, indeed, receives 27 damage. And, because the "Inspect" button does not show the exact health of the inspected enemy, in the end it becomes the game of guesses anyway. I know this, because in a couple of fights I used (admittedly flawed) tactics of alpha-striking, when I really wanted to kill one particular enemy in the first round. There is no way to calculate; only stack all the possible buffs and see what happens.
So while math exercises are fun and useful, this game can not be perfected to precise numbers like in WoW DPS logs.