The proper way to test Palisade's "Elimination" of hate loss has less to do with damage dealt and more with damage taken. Volatile Enmity is going to decay at a constant rate, same as it always has, and while it'd be cute if Palisade froze that, I sincerely doubt that it will.

So in order to test the effects of Cumulative Enmity being lost, you'd need a scenario in which you're normally losing more than what you'll recap thru a melee swing or two. This says to me mobs that will take a LOT of your HP off at one time, and ideally don't take much in the way of physical damage. It'd be nice if it makes us immune to hate resets (or at least lets us keep our CE while VE is reset to 0), but I won't get my hopes up on that one until proven otherwise.