Upstream performance does tend to drop off quite rapidly as distance increases, and the high frequency performance of the line deteriorates.
There is something odd, almost like you are connected to the wrong pair, or to a different cabinet owing to the incorrect information on the Openreach database.
it is also odd that the dslchecker shows your down down connection at 73.82mb on 1/2/20 but your hub stats from this morning show connection 55mb
The 73.82 mb value is matching up with the max data rate on the router i.e. sync speed/max attainable. The 55 mb is the data rate.
These speeds have been checked with a smart hub and a hub 5 and both devices give me the higher sync speed on the downstream and 55 mb data rate.
It is my understanding the observed speeds on dsl checker are showing the max attainable sync speeds.
Looking at this it indicates to me I'm still on the 55/10 superfast 1 wholesale product and not the 80/20 superfast 2 I was told would be activated today.
No reconnect of the router happened since the order was placed or overnight last night which happened on the last regrade of my fibre service.
I am 100% sure no regrade of my service occurred since my order and I have not been put onto the 80/20 superfast 2 service that has been ordered.
The dslchecker results show the actual connection speed not the attainable so there is certainly something wrong with your line information as posted by @Keith_Beddoe
that comment contradicts an article you linked to in a post on 21/11/18 with regards to changes to dsl checker.
"Openreach are sharing observed speeds in the form of actual sync speeds in Mbps or Max attainable line rates in Mbps on capped lines"
To put it another way.
"The “sync” speed being reported is only looking at the wholesale side of a line (i.e. it will report the best “sync” for your line, which might not be the same as your current package)."
Forgive me if I am not quite understanding this but if I am on the superfast 2 package then I would have thought I my data rate would be a lot closer to the reported sync rates as this should cap at 80 not 55, especially as there is some scope on the noise margin?
Later tonight I will reset and connect all the routers and spares I have and take screen shots of the stats.
Will this be enough to get a BT employee to look into this matter for me.
I have taken out the superfast fibre 2 package and the line has definitely not been regraded.
Router stats from tonight from a smart hub and hub 5. Im sure i could dig out an old HG612 but I don't want to keep disconnecting my connection and cause further issues.
It certainly looks like you are still on superfast fibre 1. A mod should drop in tomorrow.