The rate at which Volatile Enmity decays is constant and unaffected by anything. Cumulative Enmity decays only on certain events (taking damage normally) and is only affected by a few skills, including but not limited to Foe Sirvente and Guardian.
The Enmity stat on a piece of equipment only affects the amount of enmity you initially receive. Nothing else at all.
For the millionth time folks, Enm+/- affects decay of actions performed while the stat is active/equipped. I.e. if I cast Cure4 in enm+10 gear, then switch to enm-5, the Cure4's hate decay is at enm+10, NOT enm-5.
