I can recommend a book that is probably out of print, but that you may be able to get thru your local library via interlibrary loan. It's titled "Adelle Bartlett Harper's FAMILY LINES" by, guess who, Adelle B H etc.. Published privately in Atlanta, GA in 1973. It is a complilation with history, and a who's who of these Fitzpatricks. Gives you an idea of who married who and when, and when some of them died so you can more easily research wills.

In a nutshell, here's some info that may help you that I have from this book and then some:

Constantine's wife Mary "Polly" Perkins F. died in Oct 8, 1856 in Morgan county, GA. She has a will that I have seen on microfilm, but I don't have a copy so don't know if there are any slaves listed.
Constantine & Mary's children etc:

1) SARAH, married Tom COOK, July 6, 1814, Morgan County
2)ELAM (my ggggf) married Mary HARWELL JONES (her second marriage), he died in 1841 in Tuskegee, AL His slaves, and the slaves his daughter inherited are listed on Doll's website.
3)ZENO, m. Louisa Maria HOLLAND......living children were:

a. Calvin Perkins

b. Zeno, b.Feb 19, 1850

c. Clarence Lawson

d. Edward Butler, m. Margaret O. MARTIN

e. Charles Marion, m. Kathleen REID
4) Mary Frances, 1812-1884 m. Peter WYCHE WALTON; had

a. Virginia, 1832-1900, m. David E. BUTLER 1818-1886

b. Frances Rebecca , 1836-1856, m. Mr. WADE

c. Peter Wyche, 1840-1916, m. Sue REID b.1845 in Eatonton,

Putnam county, GA

This is the tip of the iceberg, but the names and dates may give you some leads for wills to research, and families to look at. We have found, my research pal and I, that these families seem to have travelled in packs; migrating to the same places, married into the same family groups....the Scots-Irish way, which is who they were.

You say you are far away from the place you are researching....me, too. I live in MA but have been researching my families in the south like you are. I have never gone down to any archives, but I have relied on the LDS library for microfilms of the stuff in the archives. Another researcher (conicidentally researching the same families' slave connections) turned me on to this
and it's great because it's inexpensive and pretty extensive. You can see what's available to order online, and you don't have to be Mormon, or pretend you want to be one to use the LDS libraries. The site's home is Familysearch.org and you can access the catalogue and also see the location of one the LDS libraries near you.