Here is fruit from a F1 plant in one of the crosses I made with the EFS plant described above. As I had suspected, the EFS gene in the heterozygous state gives a normal phenotype with exceptional shelf life. Flavor was very good, especially considering one of the parents was a commercial paste type. More detail on extended shelf life strategies here:
http://www.frogsleapfarm.blogspot.co...ing-shelf.html