Surf Soho WiFi 5 Ghz band persistence

I am using InControl to manage SSIDs and radio settings. Because of spotty performance when the radio strength is below -80 dBm I have set a threshold for the 5 gHz band at -80 dBm. But it doesn’t seem to matter as a client will move to a place where the radio strength is -70 dBm but the connection remains.