If you're soloing it, the max HP is mostly irrelevant. The entire goal is to keep average damage taken below the average amount Torpor heals. Max HP is only the main tanking stat here because of complete heals scaling off of max HP and the need to lower variance in the number of combat rounds until death. Almost all of the healing in this fight is going to come from Torpor, and reduced variance in # rounds until death doesn't help you because you have a fixed amount of healing and are going to drag the fight out long.
Its also relevant for some mobs where AC doesn't do anything really because their min damage is too high of Atk values are too large (Guardian of Takish is the worst offender, even Avatar of War has some decent mitigation from high AC, Takish min hits for like 900 and max hits for 1000, so an infinite AC would mitigate 10% of the damage) but that's definitely not the case here.
56 AC vs. 110 CR is less clear as its really hard to put a definite amount on specific numerical contributions to these, but I would probably go with the cold resist.
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