Should I maintain the connection for a few days with the test socket & microfilter or just connect to the master socket?
I would leave it in test socket as that eliminates the master faceplate and internal wiring as a problem
I’m not sure that the difference in what Fibre 2 will provide is worth it , given the small download increase over Fibre 1, upload speed may never reach the 10Mb limit of Fibre 1 let alone 20Mb….IMHO the 55/10 profile may be better (price v performance) unless you are getting a deal and the price you are paying is the same for F2 as F1.
You may see some increase in speed if ( as stated ) 55Mb is a banded profile , but even if it is a banded speed and the banding is automatically removed after a while , any extra speed may not amount to much, was the upgrade your idea or were you advised it would be a worthwhile upgrade ?
Have you performed a quiet line test , if the line is noisy then fixing a noisy line may deliver speed gains but otherwise you could be paying for F2 when F1 would pretty much provide the same performance
Here are the results after six days;
MyBT page is still showing the "normal available speeds" in the range of Fibre 1 and not Fibre 2 (don't know if that's important).
From stats you posted an upgrade for literally a few mbs on connection speed and even less on download and no change on up speed I would just stay with my current speed/contract