After unplugging/replugging into a different socket seem t have resynced at 1.5Mbps.
By the looks of the stats (below) I think this is as good as it gets and I except it might not stay here for long.
Bandwidth (Up/Down) [kbps/kbps]: 448 / 1,504
Data Transferred (Sent/Received) [MB/MB]: 3.24 / 40.24
Output Power (Up/Down) [dBm]: 11.5 / 16.0
Line Attenuation (Up/Down) [dB]: 31.5 / 63.5
SN Margin (Up/Down) [dB]: 9.0 / 6.0
I am well informed about the 9dB normal target margin and the importance on the SNR Margin with Max but what does "Output power" mean? This is not a figure I ever had a value on when on the 512K/IP Stream 500 service?
Perhaps if someone can tell me what output power is I could answer my own question