The line attenuation is high - I'd day that's about 1.2km+ of cable. Are you any like that far from the cabinet? If you are a lot close than that, then this is either a very convoluted route or a very poor line. If you can compare the attenuation stats then it would allow for a comparison. I suppose it might also be a line card fault. The OR engineer who installed this (assuming it was an OR engineer) should have been able to do some tests at the time.
The upstream noise margin is about 11dB higher than it needs to be, so it could, in principle sync at a much higher speed. Quite why it hasn't, I don't know, although I'd speculate it might be that upstream sync is set never to be higher than a fixed fraction of the downstream.
In any event, if the stats are wildly different from your neighbours, and you are on BTinternet, you may get more help going through the BT Broadband forum. I think there some broadband staff who deal with problems and will have access to more diagnostics.
https://community.bt.com/t5/Broadband/ct-p/BB



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