The priority goes like this:
Individual AP setting > Specific AP group setting > default AP group setting
@Greg that should have worked. Double check the AP's mac address and make sure it's the AP you applied the individual settings to that is still showing all 3 wlan.
Another thing to be aware of is that you might be seeing the 3 wlan on one of the radio and not both, make sure the individual AP setting has Staff wlan on both the 2.4 GHz and 5 GHz radio.
If the individual AP setting has the Staff wlan on both the 2.4 GHz and 5 GHz radio and you are still seeing all 3 wlan, please open a support ticket with our support team.