the 10 day auto learning doesnt exist on FTTC. There is no MSR.
I assume the figures you looking at are supplied by your isp, the problem is without the modem stats you cant assume its down to DLM, it could easily be a lower line speed due to noise and you could well still be on 6db fast path.
As far as I know DLM manages the line based on the consistency and amount of CRC errors and if excessive disconnections.
BT Infinity 2 Since Dec 2012 - Estimate 65.9/20 - Attainable peak 110/36 - Current Sync 71/20