Well one of the reasons your HP appears lower is because you're using glyph of indominability (which is a good thing and you should be using it). It is a better trinket than a lot of things out there, but it does make your HP look lower when really it gives very solid EHP. You're also an engineer and use the awesome 885 armor enchant instead of geting 60 more stam from BS or 63 from JC (which I would contend is again a good call, just makes your HP look lower when really your EHP isn't as bad).
Shoulders: switch to the 30 stam/15 resil shoulder enchant, and gem it with 30 stam, that will be a 54 stam increase right there.
Cloak: even though you are an engineer, flexweave underlay is not the optimal enchant (unfortunately), pick up 225 armor to cloak.
Chest: Getting the Cataclysmic Chest guard, gemming it with 3x 30 stam gems and 275hp enchant will be a huge HP buff (and armor buff).
Switching the gem in your bracers will be a 9 stam increase, same with gloves. Keep the hybrid gem in your pants for the meta.
Put a 30 stam gem on your belt, that will be a 30 stam increase, also look into "Indestructible Plate Girdle." It will be a nice HP increase for you.
Changing the Parry/Defense gem in your boots will net you another 21 stam. 123
Replace the keystone great ring. Goto the "easy to get gear" section in my guide in my sig and you can see there are a couple of options, there's also like 6 other gearing guides in there that can point you in the right direction.
The chest alone will be about a 1375 HP increase (+modifiers from talents and kings) and lots more armor
Gemming/enchanting will be another 123 stamina increase + armor from the cloak.
So with all that + gearing (such as belt and rings) I can see easily about a 3k+ hp boost +a bunch more armor.
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