Interesting list. Five public HBCUs plus 3 small private schools. You will find them all at the bottom of any D1 ranking list most years. I think you'll find what you would expect from schools that lose a lot... higher than average turnover.
I've known kids at UMES and Delaware State (which would fit your list). All white kids attending HBCUs. At both schools the draw is an affordable education and honestly, just being able to say that they play D1 baseball. Very high turnover with the ones I've known. I think the problems were mostly the losing and/or lack of playing time, more so than cultural. Also, just a bad fit academically because they didn't give that much thought going in.
But I've also known a couple who graduated. Played baseball (the main draw), got their degree, and didn't accumulate huge debt.