Phew!
Was all that worth it?
Well - when I did all the above, I went from

to
At that point, my SNR was 6 - which is considered to be about as low as you can go and maintain a stable connection
(remember, my SNR was 30 - my new connection traded this off, giving more speed as the SNR was reduced)
Becuase I knew that my new modem (Netgear DG834GT) was good at keeping a connection at low SNRs, I then tweaked it downwards... to 2.5 (this is very low!)
And I got
That was a bit tooooo low though - the connection dropped out after a couple of days.
Which is fine if you can live with rebooting the modem every now and then, but I wanted a better compromise really.
So I've set my SNR to 4, and now get a stable
so I'm happy
