healer vit points

[Viridiana]

My spells are 1.8s gcd

I find that extremely doubtful. I assume what you mean to say is that your cast time is 1.8s. Your GCD is your recast time, which is about 2.32 based on your lodestone gear. Your GCD is what would have to fall below 2.22s in the math I did above, because your recast time is what limits your healing throughput.