For what it is worth, J-O'B Operating Co. does work for me also. They're located on the 8th floor of the JP Morgan-Chase Building on Texas St. in downtown Shreveport.
You might try Argent Financial Services out of Ruston; Joe Rainer would be the individual I would contact. They handle various mineral/royalty management services on a percent basis or fee. Seem very professional and competent.
Shelby