Compared to the below you're not getting a good speed for the attenuation, especially upstream Full stats from test socket would help, also try it in ADSL2 and G.dmt modes via http://192.168.1.1/adslcfg.html to see if they do better (unlikely, but worth a try).
Rate (Kbps): 6426 kbps 961 kbps
SNR Margin (dB): 9.6 8.8
Attenuation (dB): 47.0 23.7
Output Power (dBm): 0.0 12.3
Super Frames: 18811148 18811149
RS Correctable Errors: 58231 65329
RS Uncorrectable Errors: 890 65504
HEC Errors: 9338 0
Total Cells: 1771943 542672
Data Cells: 52984247 11798664
Bit Errors: 0 0
Connection Up Time : 3:17:14:04
MaxDSL - goes as fast as it can and doesn't read the line checker first.