So with Auto 20/40/80Mhz and Smart Connect, Apple devices don't work?
Could you give more details on what apple devices you have?
What OSs are loaded on each device?
What wireless connection rates are supported by each device?
Are you using same SSID names on each radio or different names?
FYI, some devices don't support 80Mhz channel width. Check with Apple to see what is supported.