Getting to this point you've eliminated what may have been troublesome 'dangly' filters using a faceplate with a built in filter - and the line is quiet. There's no crackling or noise .
But the speed is about the same as it was two weeks ago. It may be worth checking for other forms of interference on the line.
Not from crackling connections or dodgy components in a filter. But maybe unwanted radio interference. This could come from a faulty phone charger type plug that's plugged nearby. Or perhaps an Energy saving light bulb (LED or Compact Flourescent -CFL) . They both may be working fine in that they charge your phone or light the hallway but they might (and granted it's a small possibility) be generating interference that could mess up the wanted signals down the broadband line.
So perhaps that could be something to check? Does the incoming line (and the line lead to the router/hub) pass by a possible source of inteference? Try switching off or unplugging nearby chargers or Energy saving light bulbs. Or even a nearby TV. And re-check the speed. Think back... Did you change a lightbulb nearby about two weeks ago?
As you are in a banded profile moving to test socket or changing master by inserting filtered plate will not immediately improve your connection. You need to get a stable connection which sounds promising as sound problem gone and then it takes 3/5 days stable for banding to start to release
Some interesting news. After many years waiting for Fibre to be installed, I have been advised via Openreach's website that the work has been carried out and I can now order infinity. Surely, too much of a coincidence that this work happened at the same time as my ADSL speed dropped to 0.5Mbps?
I will look to get BT infinity as soon as possible and hopefully it will be the end of the story...
enter your phone number and post results remember delete number http://dslchecker.bt.com/adsl/adslchecker.welcome
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For all ADSL and WBC Fibre to the Cabinet (VDSL or G.fast) services, the stable line rate will be determined during the first 10 days of service usage.
you must almost be on top of the cabinet probably 80/20 if you take infinity 2 and curently available