hlog is fine so no bridge taps in the copper loop etc
re qln I think B*cat has put it in the nicest possible way "QLN is a little spiky".
Your SNR per tone is a direct reflection of your QLN... basically the line is 'noisy', but I dont want you to get paranoid about it and think that its something that BT can fix.
Theres a few spots which could be crosstalk centered around tones at appx 1450 and 1700. You cant do anything about that.
You also appear to have a fair bit of what may be background mush. ie noise from EMI/radio/electronics/atmosphere.
The best thing you can do is check your internal wiring is in tip top condition. TBH its not really bothering you atm as you are only on the 40Mb product and not pushing the line to its limits.
How do you mean "makes a quick exit qln/snr pertone"?
Chasing the cause of noise is like falling down the rabbit hole. Its not affecting you atm so aside from there's no harm in checking your internal wiring - leave it alone and forget it.