Lets hope it improves things
What is the attenuation of your other line? It's got a decent sync especially with it's TSNR.
If possible it's always useful to know the line stats of your neighbours!
My attenuation is 51db as I mentioned. My close neighbours are about the same and the people I know on route to the exchange (which is about 3.2k away) I see the attenuation dropping so it's pretty obvious if the line has a 'normal' attenuation of if there's some bad wiring/joints/quality etc.