Improving LF of Piano 2.1 (dual mono)

Has anyone considered adding a supercap to each of the DACs on the Piano 2.1 to
improve the LF response?

IMO, this is only area of weakness in the Piano 2.1(dual mono)/Kali setup. With
a linear supply feeding each of the PI and HAT, this combo has a very accessible
SQ (detail, space, resolution, musicality).