Tank HP currently does scale further and further from the other classes HP because they're not receiving HP buffs from 5 pieces of their gear either, which is why I'm an advocate of just adding Vit + Mainstat on every piece of gear and going from there. Honestly they shouldn't be messing with our stats/scaling *at all* and just lock us at an attack power some % behind DPS, then make adjustments to tank DPS in the rotational side with potency values and what not. The whole 'single actual stat + substat' thing they've got going on with accessories is completely outdated. Gear in general in this game is completely outdated.