The Local Error seconds allied to your description of the wiring suggest a problem within the house which is worth a simple job to try correcting.
Such a problem could very well cause a low speed in itself, plus instability resulting in the high downstream margin. The high margin is reducing your connection speed by at least 500Kbps and possibly much more, but as XRaySpeX says, on that attenuation you should be connection at 6-7Mbps. It is highly unlikely to be a "central" problem, but it could be something like a regular source of considerable noise between the area and the exchange affecting a lot of lines.
Edit - 500Mbps was an amazing speed loss. Thanks to cheshire_man for pointing it out.
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Edited by RobertoS (Thu 25-Aug-11 23:08:06)