Beating my head against the wall
FIXED
Hi Bob,
@BobR1 wrote:Got the additional diagnostics [attached] on a different browser - they look fine. The only curiosity from the earlier test is a Ping speed of 36ms versus 13ms.
Latency can vary a lot as when you run a speed test, it's the response time between your device and the server that runs the test at the other end. Anything under 60ms I'd generally say is OK although obviously if you play online games you'd be wanting as low as possible <10ms. Try running a speed test Here to compare.
@RealAleMadrid wrote:
In my opinion the engineer didn't really do anything apart from changing the faceplate which they seem to on any visit for no particular reason, usually because they don't know what's wrong and it's easy to do.
The engineer also carried out a full DLM reset.
@BobR1 wrote:HI Gandalf, I noticed this morning that the DLM had obviously intervened overnight as indicated by the 'modem uptime' being some 6 hours longer than the 'DSL uptime' being reported by DSLstats this morning. I therefore ran the BTW speedtest again to see what had changed [attached].
In summary, the comparison for the downstream stats between the 15Oct second BTW test and this morning's test is:-
Download speed achieved 59.91 versus 56.88 [A not disastrous decline]
Acceptable range of speed 40-67.43 versus 40-59.4
IP profile 67.43 versus 59.4
Given the higher profile yesterday wasn't generating errors that would be a cause for concern after the router re-boot I'm wondering about that IP profile reduction.
The IP profile dropping would be a symptom of your router sync'ing at a lower speed to the cabinet. This should be somewhere between 90 to 96% of the sync speed, and with high retransmission enabled it'd be towards the lower end.
The full profile is still "Downstream: 0.128M-80M4dB with Retransmission (High). Upstream: 0.128M-20M with no error protection" even after the full DLM reset but it's good to see the SNRM's gone down.
I'd keep an eye on things and let us know if you notice further issues or developments. 
Hi Bob,
There’s no benefit for us to ‘manipulate’ your SNRM to lower your speed, plus that isn’t even possible. I appreciate the frustration, but we’ve already established your speeds are within the supplier expectations for your line, so unless one of our tests shows an issue, there’s little we can do in the way of further investigation.
Are you experiencing any real world problems with your broadband service due to the ~4mbps lower download speed between now and October?
If you’re just curious and seeing what you can do to get the most out of your connection, that’s fine though and feel free to post as other people on our community, may that be my colleagues or the good folk who roam around here may be able to offer you further advice or guidance.
I’ve asked the mods to merge your other thread Here with this one if possible as you have two topics going on the same subject, which may cause a little bit of confusion. It’s always good to keep everything in one place, otherwise what’s been discussed already may be missed.
No problem Bob, and apologies for the confusion there. 
I do appreciate what you’ve said, but as long as you can do what you want to do on the Internet and you’re happy with the price you’ve agreed, I’d say that’s a win.
I also do get though wanting the most out of your connection. It’s not always possible to achieve the same speed or have your line in 100% perfect shape with no background noise (as long as there’s no audible noise on your landline phone) due to the infrastructure.
However if there’s an issue like your connection drops, your speeds below where we’d expect, our tests show some sort of issue, then I agree I’d like to see a little further investigation to get the bottom of the issue.