UPDATE
I have been in contact with support and after explaining a few times what the issue was Excessive buffer bloat whilst downloading , They set up monitoring of the latency but their graph didn't really show the detail needed , so i sent them snapshots of my tbqm and f8lure graphs and they agreed this was not normal,
so to rule out my equipment, they asked if i would mind if they sent me a fritzbox to rule this out , i set up the new router and tested to see if it had resolved the issue, which It had, so out of curiosity i swapped back to my old set up, and the problem did not re-occur, to the cause
? maybe some kind of glitch with the DSLAM /line card or the modem that cleared as a result of connecting to a different modem ?
And the old hardware had had several re synchs following the network migration in April ,although it had increased since then , as a result i lost the full synch and 5db snr i obtained following a re-synch following a brief (under 30sec) power outage, But buffer bloat back to normal ,infact a slight improvement on upstream buffer bloat when several FTP threads are active
