stats look ok but connection time at 9 min very short was that hub dropping connection or manual reset?
I would split the 2.4/5ghz networks http://bt.custhelp.com/app/answers/detail/a_id/56419/~/how-do-i-split-my-bt-hubs-ssid-%28wireless-ne...
did you try btspeedtester diagnostic test with ethernet connection to check download speed http://www.speedtest.btwholesale.com/
Normally it should say 75mb then when speed test done it should be 64-65mb because I was guaranteed 65mb download.
Even without it splitted, I will give your advice a go.