I am afraid you are comparing apples to oranges.
Playing a CD off a transport should be compared to playing your burnt CD flac files, rather than with streaming. There are too many variables associated with streaming like speed and bandwith peculiar to your home or locale setup, quality of ethernet switch, ethernet cables, ethernet implementation within the dac, etc
If compared to the burnt flac files via usb, again there is the usb implementation within the dac, usb cable quality, etc.
It is quite established today that streaming SQ is generally inferior to that of playing cd"s direct off a transport, or playing flac files off a hard disc either via ethernet or usb, all other things being equal.
If you take streaming out of the comparison, it will be interesting to find out the ranking of SQ with regard to transport, hard drive via ethernet or usb.
Enjoy the SQ of your transport as you rightly should for now.
Cheers!