Currently, at least early game, the 5% of max HP and just straight HP stacking with 2 vamp items is just so much stronger than anything else. That I feel like the numbers need massaging on that passive. Being able to effectively get EHP, Damage and sustain from stacking the same attribute is just way too efficient. It does start to fall off in the 40s. But other approaches at the same gear level didn't get past the 20s. So it's a bit overpowered.