I don't know if is is useful, but this is what I get on a Telekom VDSL with the same hardware and the same Firmware:
Data Rate: Down: 63.668 Mb/s / Up: 12.735 Mb/s
Line Attenuation (LATN): Down: 13.5 dB / Up: 13.1 dB
Signal Attenuation (SATN): Down: 13.5 dB / Up: 13.5 dB
Noise Margin (SNR): Down: 4.8 dB / Up: 25.6 dB
Aggregate Transmit Power (ACTATP): Down: 0.5 dB / Up: 8.3 dB
Max. Attainable Data Rate (ATTNDR): Down: 61.050 Mb/s / Up: 38.219 Mb/s
Line Uptime Seconds: 13645821
Line Uptime: 157d 22h 30m 21s
I pay for a 50/10 connection, thus I don't have much to complain about. If I look at the historical data, it seems that it was syncing at an higher max down rate initially and it stabilized to these values after a few reconnects and from what I can see it never tried to bump them up again. I don't remember if the higher data rates where with this firmware or another.