Bonnie, tenor banjo sets suitable for the GDAE rather than the "standard" CGDA tuning can be hard or in some areas, impossible to find so I'd guess many of us who play this instrument have done a fair amount of experimenting.

When I got my new banjo, I settled on using the guages that were on it when I tried it which were 40w, 28w, 18w and 13. Seems to suit me.

Jon