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I have the router set up as a wireless AP and I am trying to stream some test videos of varying sizes and quality to see if I can use it stream 4K reliably on my entire network. I have a NAS serving up the files and I can stream them quite easily with gigabit ethernet but when I try to stream over the 5 Ghz band, it struggles when bitrates go over 25mbps. I am using a couple of android devices to stream from both using AC with excellent connection to the WAP. The one I'm testing heavily is just 2 feet away from the WAP and using an app called WiFi Speed Test, I can consistently get only 7 MB/s download speeds. The 5ghz band is set to WPA2-PSK and AES encryption with Auto for SSID and Channel Width. I can see link speed of 866 Mbps on frequency of 5785 Mhz but I am not seeing anything close to actual speeds.

I have tried manually setting channel width to 80 Mhz, different SSIDs, switching cables, moving the WAP around, no dice.