Thank you for the un-cropped version of the Hlog graph. It is nothing like what I have ever previously seen.
Neither have I.
Hlog's maximum attenuation/minimum value for VDSL2 connections is around 96dB (i.e. no data, bitloading etc. can be obtained from the affected tones).
Hence the perfectly flat shape of the graph, in places.
Maximum attenuation for VDSL2 connections seems to be somehwre between 63dB & to dB.
It's most unusual to see such Hlog graphs from a VDSL2 connection.
To me, it indicates quite severe physical line problem, unlike the usual 'V' shape we see when bridged taps are present.
Unless the ADSL2+ connection is having a negative effect (not seen previously).
The issue does seem to be within the the ADSL2+ tone range.