dsd64 to 128 doesn't make sense from a technical perspective. You can't add more resolution or accuracy by up-converting. All you're doing is doubling or interpolating data. You can't create data from nothing.
It's kind of like trying to scale a picture at 300 x 300 pixels up to 600 x 600. It will NOT increase in resolution *and* you will see artifacts unless the scaling is done with very careful (and sometimes very clever) algorithms.
Brian.