1. isc-dhcp-server running under Debian
3. Only 2.4 band is available on this profile.
2,4. Seem to be the same to me. This same profile is under the 325 with no issues. Not sure what you are requesting here.
These Windows 7 laptops do not support anything but the 2.4 band. If I add an LDAP authenicated profile, they join with no issues after the credentials are entered on 2.4.
If i put the Android units in the MAC authenicated profile which is 5 band, connect with no issues.