My theory requires a PLD and a SCH with Empy+2 body. In all of the tests, the PLD will need capped enmity on the monster. The SCH will need to perform 3 tests (More than 3 to get substantial amount of data, but 3 different types).

1. Naked nuke for a control.
2. Empy+2 body only nuke with Addendum: Black to test enmity difference.
3. Full nuke set to test variables.

The absolute key to this test is Libra. Libra works on a % based guessing game of where enmity lies. By yourself you will always have 100% of the mob's enmity. That is why the PLD is key to reach the enmity cap and give us a true 100% level. After each nuke (and I recommend a fresh mob for each recorded enmity level) use Libra and note where you stand in relation to the PLD. Say a naked nuke gives 70% enmity. I theorize that a nuke with Empy+2 may give a result as low as 35% (though probably closer to 50%). The reason for the third test is to see if it is a flat enmity change such as -20, or percentage based such as -50%.

Be mindful of skews to these results if you have +/- enmity merits, such as myself. And by all means, post your findings here. It is easier to split 1 set of results among 50 people, than 50 sets of results from one person.