Have you tried using a DAC with a USB noise isolator? I don't get any hiss with my setup:
Neutron Player on Android > USB OTG cable > HiFimeDIY USB noise isolator > HiFimeDIY USB DAC > Beyerdynamic DT880
Although I don't use all that any longer, for convenience sake I just use a wireless Audiotechnica ATH-DSR9BT which supports aptX-HD and produces "good enough" quality with no hissing/noise.