Anyway, Made the wifi group, chose zero handover roaming, put the channel in there, added a SSID (same as before, same key as before)
Move the APs from the old default group to the new zero handover group and they just stop broadcasting. No SSID shows on any devices at all, even several mins after it changes back from provisioning to connected.
Put the AP back into the default wifi group and the SSID pops up very quickly.
So is it working for anyone else? Do the AP's need to be in radio range of each other or something?