with the help of Ulrich BrĂźggemann of Audiovero (maker of the Acourate toolbox) we have again thoroughly investigated into this issue. Using Roon with other drivers and/ or replacing the Roon convolution engine with Acourate convolver software it appears, that the noise issue is an ISSUE with Merging Technologies.
Running it through with them, they have actually confirmed it. It is followed-up by the Merging engineering team under ticket number RAV-1230.
For the time being nothing to do here for you and/ or your team.