Hi Jack * Welcome to the Kitz forum.
AS mentioned by b*cat, an initial look at the snapshot graphs indicates that you appear to have "quite" a good connection.
However, for the very short distance of 110m (if reasonably accurate), I would have expected to see maximum 79999K sync speed.
Your attainable rate of over 100000K suggests that it could easily sync at the currently capped 80Mb, if "things" weren't restricting it.
Now, looking at your Plink log, a few things stand out as probable reasons for the less than Max sync speed:-
SNR (dB): 9.1 12.8 - Shows some "spare" capacity, but not as much DS spare as I would expect for only 110m.
D: 1549 1 - Interleaving depth - (1 = OFF), so DS of 1549 looks very high, again for such a short distance.
ES: 6827 39 - For around 72 hours connection (AS: 259298), that seems a high count. My connection is upward of 850m & I only see around 100 DS Error Seconds in any 24 hour period.
INP: 4.00 0.00 - Impulse Noise Protection seems quite high, suggesting that DLM has seen quite an amout of Impulse Noise on your connection. MY connection's value is only 3.00 DS.
delay: 8.00 0.00 - This will increase PING times as part of DLM's Interleaving & Error reduction attempts.
MOst other short connections (up to say 200m or so) have zero values for INP & delay, with a values of 1 & 1 (OFF) for Interleaving.
Regarding your ongoing graphs, unfortunately more or less everything looks quite poor.
Apart from an occasion spell of calmness, your SNRM fluctuates quite badly, especially over such a short distance, suggesting some sort of electrical or radio frequency interference, although your QLN graph looks quite good.
Could that be something in your home, I wonder?
Various error counts are cumulatively high (as reported in your Plink log) & minute by minute are very high, again when considering the short line length.
Many users who can sync at the full capped 80Mb demonstrate zero (or certainly less than 10 errors per minute) for RSUnCorr, FEC, HEC & CRC errors.
As far as reporting this to your ISP/BT, I suspect you will be told that "your connection is performing within acceptable limits", especially as sync speeds are high.
I don't know exactly what criteria is used for error count per minute/hour thresholds though.
Additionally we can see from your pbParams band plans that you are connected to an ECI cabinet DSLAM:-
Discovery Phase (Initial) Band Plan
US: (0,95) (880,1195) (1984,2771)
DS: (32,859) (1216,1959) (2792,4083)
Some OR staff may argue that you are not using the compatible provided ECI modem & that in itself is causing the issues.
That would be utter nonsense as we have monitored other connections to ECI cabinets via HG612 modems that do not display the issues you are seeing (unless your unlocked HG612 is slightly "faulty").
Finally, OR may try to discredit your claims of instability/problems as the data you possess has been obtained by equipment that has been unofficially "hacked" & therefore cannot be classed as reliable data.
Again, that would be nonsense as all that has been done is to open the modem in order to access the stats that it has been generating all along.
FWIW, I have attached a couple of graphs from your connection to demonstrate my comments above.
Cheers,
Paul.
