https://imgur.com/a/5VHLa
On a previous line, I had an attenuation of 16.5dB, where the line was around 375m long. In 2012, it had an attainable of 90/24. When we left in late 2014, that had gone to 78/22 ... when a 6dB target was the norm.
I'd say you're somewhere around 400m too, and hanging on to a decent speed, in spite of crosstalk.
That kind of distance is probably too far to get decent G.Fast behaviour. That may improve with future variants, or if BT work out how to re-use the VDSL2 spectrum.
I'm sure I had a higher SNR when I was with Sky, but I didn't keep any logs to prove it..
That'll be crosstalk