You are mixing up sync rate and throughput rate.
Bandwidth (Up/Down) [kbps/kbps]: 448 / 4,960
are your up and down sync rates. The down rate determines your IP Profile, which on 4,960kbps will become 4000kbps, (as per the table in the pages I linked to), and your throughput rate should then get within 60% and 90% of that in normal running.
As has been said, the update can occasionally fail. However in my experience it is usually triggered by the night-time check the system automatically issues. I would leave it on so that check can take place. When that happens, no re-sync is needed.
Hence my suggestion you do a re-sync during daylight tomorrow, if it doesn't happen tonight. Possibly leave it off for 10-20 minutes to make sure all parts of the system recognise it.
Leaving it off overnight I have great doubts is anything more than a myth, or perhaps it is just a way of guaranteeing that recognition. Theoretically 2 minutes switched off time should be sufficient.
My broadband basic info/help site - www.robertos.me.uk
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Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 54.0/14.9Mbps @ 600m. - BQM
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Edited by RobertoS (Mon 28-Jan-13 20:42:44)