"downside focused" is a fantastic term, worthy of replacing both "negative" (not descriptive) and "suffering focused" (too intense for some contexts).

I think I'll call myself a downside focused utilitarian from here on.

Good points. I don't think "(benevolence)"/"(beneficence)" adds anything, either. Beneficence is effectively EA lingo. You're not going to draw people in by teaching them lingo. Do that a little further into on-boarding.