45second cooldown and usable in a stun are not fine, not when the absorb is a considerable amount, It would be a far better nerf than targeting all their other sources of healing.
It is easily the least punishing cooldown they have (in that they can use it completely incorrectly and it is still extremely potent).
I’m not saying the amount needs to be reduced, but it needs to not be usable in a stun and the cd may need to be increased.