You're absolutely right on the volume of material. Enjoy the search and journey!
Here's what I can offer:
Undaunted Courage: Meriwether Lewis, Thomas Jefferson and the Opening of the American West - Stephen E Ambrose
Complicity: How the North Promoted, Prolonged, and Profited from Slavery - Anne Farrow, Joel Lang, and Jenifer Frank
Rebels from West Point: The 306 US Military Academy Graduates Who Fought for the Confederacy - Gerard A Patterson
The Real Lincoln: A New Look at Abraham Lincoln, His Agenda, and an Unnecessary War - Thomas J DiLorenzo
Lincoln Unmasked: What You’re Not Supposed to Know About Dishonest Abe - Thomas J DiLorenzo
Emancipating Slaves, Enslaving Free Men: A History of the American Civil War - Jeffrey Rogers Hummel
When in the Course of Human Events: Arguing the Case for Southern Secession - Charles Adams
Battle Cry of Freedom: The Civil War Era - James M McPherson