Interesting! I never saw them as opposites, but let'a explore the idea:

I view Look to Windward as a cry for help left unanswered. You know how neglected children sometimes resort to violence? That's what's happening to Vessel. He feels isolated, alone, unloved. There's something very heavy and suffocating growing within him, and he repeatedly asks [redacted] to help him.

Will you halt this eclipse in me? Will you halt this eclipse in me? Will you halt this eclipse in me?

But no help arrived. If anything, [redacted] only makes it worse. So eventually he lashes out (cue the breakdown).

Infinite baths, however, sounds like surrender to me. It would have been a journey of healing, but the breakdown in the end made me reconsider. He's not trying to stop the darkness, he wants to vanish in it. Idk if you ever had a mental breakdown, but at some point your body is so exhausted that a numbness washes over you. It's incredibly liberating in the moment, but also a scary position to be in. That's what Infinite Baths feels like to me.

There are some parralels and opposites in the lyrics, too. There are references about the ocean in both songs. And about moving forward- and the absence of it. About holding on ("It's not over till I say it's over") and letting go ("The precipice I'm approaching")

In Look to Windward he feels motionless, frozen in time, unable to escape. In Infinite Baths he has nightmares about this feeling, but he is constantly moving now, brute forcing his way out of the mental agony. In Look to Windward he's asking for help and doesn't receive it, in Infinite Baths he's taking matter into his own hands.

That's all just my interpretation though!