What are all the subscores? Yes, the higher math score matters for engineeing, but they all do.
I’m guessing you mean self reporting on the app? You can still send all scores for Stanford (you posted in the S forum.) “For the ACT, we will review all subscores and focus on the highest Composite from all sittings.”.
But you should know the middle 50% as of July, for the current S freshman class. Is 32-35. That means you’re roughly in the middle, not near the top quartile.