yeah as Gary says: possibly some maintenance done during the night giving you slightly better stats - is Line Attenuation and SNRM the same? if so then its sudden drop in noise conditions
if you had QLN and SNR graphs from before when you had 6800k and take them now at 7300k we would see the difference - if the SNR has increased in general then its likely quality of the line has changed, if you have noise spikes that dont look as bad or are gone then noise has been removed from the line by whatever means - I recall you had a load of radio stations eating into your line..perhaps they are turned off??
