Like you, I'm a s-l-o-w reader as well. I finally decided I'm going to join Audible so I can listen to all the books I need to catch up on (I'll probably get through more of them quicker)!!!
You guys have been doing A LOT of reading! I've read some in your list, but not all of them. I'm just now starting My Grandmother's Hands. But to montepinto's question, I can suggest some I've already read:
Black Majority by Peter H. Wood; The Warmth of Other Suns: the Epic Story of America's Great Migration by Isabel Wilkerson; Paradise by Toni Morrison; Capitalism and Slavery by Eric Williams; The Color of Law by Richard Rothstein; Discourse on Colonialism by Aimé Césaire; Olaudah Equiano, The Interesting Narrative and Other writings by Olaudah Equiano (a formerly enslaved Igbo man who purchased his own freedom); Any and all James Baldwin! Raoul Peck's documentary, I Am Not Your Negro, culled from some of James Baldwin's published & unpublished works, essays and interviews (I bought mine from PBS and it came with a small book of black & white photos along with some of Baldwin's unpublished personal notes, but you might be able to just watch the documentary on YouTube or Amazon now); American Beach by Russ Ryder; Praise Song for the Widow by Paule Marshall; and just for you Lynda, two books of poetry, Rice, and Head Off & Split by my sorority line-sister and SC homegirl, Nikky Finney!
Most of them are a reasonable size to read, except The Color of Law and Paradise, so they won't take forever to read. Enjoy!