Hi @topleya I called there but missed you, as per the router stats you've posted the data rate is showing that its currently syncing at 65.7Mb at the moment. I can't find any faults with the line and I'm afraid there are no further adjustments I can make to improve on what you're getting at the moment.
unfortunately your stats never show your actual internet conenction time if you can get a stable connection and there a few errors then G.INP should be activated by DLM which should reduce your noise margin and give some boost in connection speed This could take 10/14 days stable provided few errors
surely if the line had lots of errors the last thing you would want is to drop the noise margin down to 3db. if struggling at 6db it will drop conenction at 3db with loads of errors