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Apparently significant numbers of black man are 'on the down low' and serving as an AIDS vector into the hetero black community.

This may be true, but your "vector into the community" wrongly implies that once it gets into the hetero community, it will spread readily. It won't, and that is because even if the small number of women who defy the odds by becoming infected then start up with other male partners, it is essentially impossible for those men to become infected unless they have open genital sores. The only ones affected are those women who sleep with bisexuals or who sleep with IV abusers.

While the risk factor for women is quite possibly higher for women than men in hetero contact, the statistics fumento is using (from CDC) don't support that it is anywhere near as difficult for men to get AIDS from women as you imply.

http://www.cdc.gov/hiv/stats/hasr1402/table3.htm

Men getting AIDS from women is about 4,000 to 5,000 per year and women getting AIDS from men is about 6,300 to 7,500 per year.

What is your source for your estimated number (500-1000) of risk encounters necessary for transmission?