I like the option "favour a little" even though it doesn't mention how much is too much. IMHO, "a little" should be only a tiebreaker. If you have candidates of the same or very similar qualifications. Then I'd favour minorities. But for the most part, talent and attitude trump all.
The only quotas I'd try to have is at the start of the hiring funnel. So I'd give equal chances for all candidates but never a guarantee of equal representation of the hired.
WDYT?