The same facts can be described in a variety of ways. There are six books on my list, and you correctly say that two of them are written by black women. Thus by your description, this 2 to 4 vote is technically a majority but just barely. In fact, your description is incorrect, because Bryan Stevenson, who runs the Equal Justice Initiative that wrote the book on Lynching, is black. That leaves us with a 3 to 3 tie--if we use your misleading disjunction of "written or edited by White Men. " In fact none of the remaining books were written by white men, only edited by them. Each of these books has about 20 pages of introduction, and every other word in them is a direct quote from a Black formerly enslaved person. I also see no reason to assume that those editors are white, as you were mistaken about the lynching book, and I can't find any evidence one way or the other about the rest of the editors.
I also prefer to support black historians and writers when I can, and most of the other material I have read on this topic has been written by African-Americans. (Including, but definitely not limited to, Haley's Roots and Malcom X books). You were lucky to have Black teachers for this topic, and I can see from this article that you learned a great deal from them. My suggestion of this course was really more for your readers than for you personally. I think some of them can benefit from this course. I know I did.