Retried this at -51, -52, and -53 enmity. All resulted in capping at -50.
I also tried see if damage dealt is somehow affected differently based on the post Whatinthe translated. Based on limited testing, I found that damage dealt and curing enmity is capped similarly to spells, so this is somewhat inconsistent with the JP post. The JP post uses horror head though, so that may have different effects.
Excluding Horror Head, I feel pretty confident that -50 enmity is the cap and affects spells, damage, and cures.
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Also, knowing the damage dealt enmity for level 75 leads to some pretty interesting things...
The mods on a level 75 mob are CE Mod = ~1.54, VE Mod = ~4.62.
Assuming no enmity modifications...
On a level 75 mob, a DD will instantly cap VE with any attack dealing more than 2165 damage.
On a level 75 mob, a DD will cap CE after 6494 damage assuming no CE loss due to damage taken.
I think this shows why PLD Invincible is not that effective with big DD's present. It also backs up the effectiveness of DD tanking when possible (for instance, on Salvage bosses).
I still need to figure things out for a wider range of mobs to get the values for mobs over 75 (the most pertinent considering you normally fight things in the 80s endgame).
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