@colin79666
Yes, I find it hard to believe that both your ZyXEL 1312-B10D's are faulty, there was so much going on with manual re-synch's and modem swapping over a short period of time that it's very easy to compound any external or internal line issue that may or may not have existed at that time.
You can always try the 1312's on your line again at a later date under controlled conditions after everything stabilises and DLM has had a reasonable time to settle down.
From MDWS, your line is still looking OK, note that US SNRM has taken quite a substantial step down towards where it originally was and your US & DS ES rates are very low / zero.
Your DS BRAS IP profile is confusing me somewhat, I would expect this to be lower that your DS synch rate !
For example my line current state: (on a 40/10 provision)
DS BRAS IP profile = 38.67
DS Synch Rate = 40.00
Data Throughput Ratio = 38.67/40.00 X 100 = 96.67% (to expectation as currently on retx low profile)
I have never seen DS BRAS IP profile greater than DS synch rate on my line ?
Strangely enough (to me anyway) apply your line DS BRAS IP / Synch figures the other way around:
DS Synch / BRAS IP X 100, 61/67 X 100 = 91.04% (to expectation for retx high profile)
I'am confused, perhaps we need input from some of the more knowledgable forum members on this ?