I am operating /8 and when calling CQ with the designator "/8" my Grid Locator is never sent in a CQ. I had added the "/8" to my callsign on the General tab.
Why do you need to send /8? FCC Rules have not required it for 50 years. The grid you send tells callers where to point their antennas with far better precision than /8. I've lived in W6 for 15 years, but the only time I've used /6 was when calling CQ on 6M CW, which, thanks to FT8, I haven't done for four years.
