No significant difference with the stats there, you synced 140kbps slower otherwise, the SNRM then at 6.3. The impression I'm getting is something may be causing periodic interference to your line. That said, I'm still thinking that the Filter arrangement you had when you posted stats in reply #14 could be better than the current arrangement, the only way to find out is go back to that arrangement, but leave it until daylight hours.
In the meantime, how is your ping currently? Also run the BT speedtester but don't bother with the Diagnostic this time, just run the first test. If you get a slow upload, run the tester again immediately and see if it's any different, if not run it again immediately.
You can actually run this first test as frequently as you like. The next (Diagnostic) part is the part you have to wait 10 minutes between tests and no more than 3 per hour, but the primary benefit of that is to get the profiles which we aren't overly interested in at this time as that side of it seems OK in relation to sync.
