Chris, Alex, you appear to be finding greater processing requirements for the hirez files but the reverse of what was expected? Is that correct?
But this is not so obviously the case for redbook?

Although this is no measure of the DAC's behaviour, it does imply the processing is stretching albeit for the reverse to what was considered likely.

Have either of you played the output to assess whether this results in any audible difference? Not better or worse, just audible...