Send ACT or SAT to Harvard?

As a student, my courses and extracurriculars all lean STEM heavy as I am interested in pursuing the physical sciences. However, as Harvard is technically liberal arts, should I submit:

(Old) SAT: 2290, 2nd time, 800M/750CR/740W
ACT: 36 Composite, 36M/36R/36W/35S, 24 Essay

I know the ACT essay really hurts me (I did get a 5 in AP Lang, though! I consider myself a strong writer, I don’t know what happened there…). Or, should I just take the ACT again in October?

This is really a no-brainer – just send the ACT score (and do not retake), as most colleges disregard writing scores as writing to a time-limit is not something anyone in college has to do.