At 20dB DS attenuation you are not exactly on the shortest of lines to your FTTC cabinet, as RealAleMadrid has said, 51 Mbps DS synch with 3.3dB DS SNRN is very likely the best your line is capable of, the 5 to 9 Mbps US synch improvement is certainly a good result.
Would think that your US G.Inp (Re-Tx) will disappear very shortly, currently DLM does not appear to leave this active for very long as soon as the ES rate decreases, would expect DS G.Inp to remain active.
Overall I think you have had a positive result, VDSL-2 FTTC service unfortunately does not generally improve with time regardng synch speeds, cross-talk being the biggest factor as more subscribers are added to the local FTTC cabinet.
You have not really mentioned what your synch speeds were before the fault developed ?