USG310 and USG110 supported AP's for managed mode

Guy's appreciate that these are now discontinued products, but I am trying to get a USG310 with the latest firmware to work as a wlan controller for a NWA-3560-N AP, the AP is also running the latest firmware (I think it was 5.1) and set to managed mode.

I have followed the various turorials but I cannot get the AP to work in the 5G band, I know it's set up correctly, but having set up an ssid for 2.4g (2gSSID) and another for 5G( 5GSSID), assigned each to the relevant profile, I get nothing on the 5GHz band, but see both SSID's on 2.4GHz.

I've tried it with a USG110 using the latest firmware and that does exaclty the same.

The two AP's work perfectly on two bands in standalone mode with the seperate SSID on each band.

Is there any documetation which explains exactly which AP's are fully supported in managed mode on the USG110 and the USG310?

This will NOT be used in a production enviroment, it's purely in a test building, and has no internet connectivity so cloud / Nebula is a non starter unfortunately.

I just need the USG to manage the two physically seperate AP's on a private network.