Greg, there's a green when ripe cherry that I think is much better than GG and it's called Green Doctors. It's a spontaneous mutation from the variety Dr. Carolyn.
I had a plant last year but it went south. However a good friend in FL sent me fruits of many kinds and included was GD. It also was highly praised at Tomatopalooza last year when gardenmama brought fruits from seeds I had sent her that had been sent to me.
It's available at Sandhillpreservation.com
Just thought you might like to try that one before embarking on a somewhat longer breeding project.
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Carolyn
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