with 5ghz i've managed a steady 20mbps tcp transfer.
on 2.4 i've tried the 13 channel (2472) because there are no conflicts here (based on inssider).
using btest from MT, tcp, both ways, i get ~1mbps, ccq under 10%, signal -45dBm, snr 56dB .
i'll try and investigate tomorrow.
thanks.