Are the roam settings used to switch between profiles within the auto profile list?

Yes, here is an example. 1. The auto profile list contains SSID_1 and SSID_2 2. Device is connected to SSID_1 3. RSSI drops below roam trigger, the radio scans for other APs and finds SSID_2 is a better candidate 4. The radio disconnects from SSID_1 and connects to SSID_2