>> now my speed has gone from 1019kbps downstream to 654 kbps,
D'oh.
back to square 1 and waiting a few days again for the bRAS to catch up
okay .. Leave your router as it is for now - SNR Margin is normally at its worst in the evenings.
Each time you re-sync your PC then the DLM will reconnect you at the highest speed it can whilst still giving you an SNR Margin of 12 or 15 (which ever its set at).
Tomorrow morning check your SNR Margin and once it goes higher than 15 (The higher the better)... then attempt another resync.
The higher your SNR Margin is then the better your sync speed will be when you reconnect.
The lesson in your case is avoid doing a reboot when the SNR Margin is less than 15dB
No sorry theres no other way of finding out your IP profile - apart from asking your ISP to do a WOOSH test.