However, i’ve now tried going to both latest 388 and earlier 386 with a factory reset and it didn’t seem to improve. Plugging the Sky router in immediatelty boosted the speeds back up and no errors.
Alas there will be a little variation between different DSL chipsets and even variations in sync of the same brand. Unfortunately, keep factory resetting and setting up the DSL-AX82U and then plugging in the SKY Hub will kill your IP profile, need to leave all alone for a good week to 10 days, just so cab can adjust to the new kit etc. which will then adjust SNR etc. hopefullly.
Be patient 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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