Honestly revert the health on tank items
During mid S7 Riot gave tank items an update to favor flat resistances over health, ever since then tanks have felt like complete trash because of the little health they gain in return.
Sunfire Cape: HEALTH 500 ⇒ 425
Spirit Visage: HEALTH 500 ⇒ 425
Dead Man's Plate: HEALTH 500 ⇒ 425
Randuin's Omen: HEALTH 500 ⇒ 350 Later buffed to 400
Warmog's Armor: ACTIVATION THRESHOLD 3000 total health ⇒ 2750 total health
Tanks already gain an incredible amount of resistances but right now lack in the health department. Resistances are only as good as how many health you have if you have little to no health you aren't going to be tanking much.
Also on a side note, revert GA while you're at it. This item is ridiculously cheap with no trade off in it's build path and can even be rushed on as a second item on some champions before 13 mins into the game. Having a second life should be a late game option not an early one.