You are operating on some very questionable assumptions which you've masked with jargon to lend credibility to your position. Kinda like phrenology. Where is your evidence that these race/gender "signals" correlate with applicant quality in any way?

But you are absolutely correct that employers do factor race into hiring and recruiting decisions. My evidence: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2018047