Hi Tom,
We're pleased you're feeling a bit happier.
However with your attenuation on a reasonable line you should be syncing at over 3,000Kbps.
That would give you an IP profile of 2,500 instead of 1750 Kbps you will be getting now.
I would also expect an upstream attenuation to be around 25 dB and not 15.5.
If nothing else, next time you have a line problem, you might ask BT Openreach to provide you with a new NTE box preferably including a SSFP.
Kind regards,
Walter