Highest HP for Level 40 Weapon Master

[Bess Blademenace]

Was wondering (after reading the steller article on weapons) are passives the only skill that add numbers to your overall HP?

I keep looking in amazement at my level 40 friends, who have higher HP than I do. Before I retrain, I want to be clear: if the highest possible number of HP is my goal, do I click each weapons passives to achieve this?

Thanking you in advance,
Bess