Fast external, slow internal

Hi All,
Was hoping you could help with a conundrum I've got, I've tried to resolve it but cannot seem to get my head around it.
Basically I've got a 5th Generation AirPort Extreme connected to my Fibre Modem running at about 75Mbps with a max download rate of about 9.5MB/sec.
I get this download speed on all machines connected either wirelessly or via the Ethernet ports.
However, when doing internal transfers across the network (from my Mac Mini Server -> MacBook Air/Pro) I only seem to hit a max speed of about 7MB/sec, and generally it's more like 5MB/sec surely the internal network should exceed, if not at least match the speeds coming from my modem as the network is obviously capable of using such speeds?
I've gone over all the settings, and my machines are all connected on the 5Ghz 'N' network with a transmit from anywhere from 270 through to 450 on the MacBook Pro.
I've read that the AFP isn't exactly speedy, so I've tried setting up NFS shares and still don't really hit anywhere near the speeds I'm getting externally.
Does anyone have any thoughts?
Many Thanks

For anyone intersted in this I found a kind of fix:
My Airport was set to have seprate 5Ghz and 2.4Ghz networks, switching this to 'Automatic' and having just one visible network causes the Mini Server to connect to the 2.4Ghz network... weirdly at 'only' 130Mbs but this actually gives me a stustained throuhput of about 10MB/sec.
Not sure if that will help anyone else.
Thanks

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