15k + HQ vit food + being in a party should raise you over a bit or almost 16k, for Thordan as a Drk I tank with 16.4k hp in full slaying, with pentamelds you should be a bit higher once you get Gordian i190. If you manage your CDs properly like Hallowed Ground on the sword oath knight and then a Sentinel and Bulwark (I don't tank it as a pld so idk what CDs other paladins use) the shield oath one. Once you know the fight like the back of your hand you can use your CDs without even thinking them.