I’m a big fan in taking colleges at their word, so:
In this case, I think optional does mean optional. Having said that, your scores are very fine scores. I see no reason not to submit them.
I’m also a believer in sending either zero or two (or more than 2 depending), Submitting one, in my mind, looks as though the applicant is trying to hide a score (which, of course, is what you are suggesting).