I do not know if you have checked for other Gale Family researchers in the South Carolina Genealogical Society Surname Directory. I found only two there, one female is located in Charleston, SC and the other male lives in Rockingham, NC. Email me off list and I will give you their contact information if you do no already have this.
It sounds as if you are having trouble getting other Gale family members to participate in the DNA project. This was a common problem when I was a officer with the Chesterfield District Chapter and a genealogy library volunteer there. This problem even occurred in my own family regardless of the fact that I purchased the kit myself for one of my brothers to do the actual test. I think there is still a lot of misunderstanding and doubt in the general population about what DNA testing will and will not reveal. We even had a guest speaker who specialized in DNA testing for one of our monthly meetings just so that she could explain things, but as it turned out she had too much knowledge about DNA testing and could not get on our level.
I would like to offer some suggestions for finding Gale family members that will participate. I see that you have submitted queries on most of the Rootsweb Surname Mail List and Message sites, but I did not see any on the Chesterfield County GenWeb site that is hosted by James C. Pigg. You should also ask Jim to add your name and contact information to the Surname page as well. If all else fails, trying sending a letter to be printed in some of the local newspapers. I checked the White Pages for Gale and the closest ones that came up in South Carolina were located in Bethune, Darlington, Florence, and Rock Hill, so you might want to send letters to those newspapers and add queries to their GenWeb Query and Surname pages as well.
I am no longer with the Chesterfield District Chapter as my husband and I recently moved to the coast of South Carolina, but you can still send a query to the chapter and ask that it be printed in the quarterly. I wish I could offer more help, but since I have sort of retired from genealogy as a volunteer, I am finally getting back to doing my own family research as well as doing more volunteer work with abandoned cemeteries in South Carolina which is what prompted me to start the Chesterfield Genealogical Society to begin with.
I do not know if the URLs below will show up as links on the list, so you might have to use the old copy and paste method.