Have you tried changing filters or convolution with hqPlayer? I have a Totaldac d1core that I love. hqPlayer with convolution help to make up for room issues. I used REW and rePhase with a umik mic. Definitely not easy, there is a learning curve, but worth the effort.
Yes on filters and modulators, but just now working on learning to use the convolution. I plan to place an order for an UMIK-1 soon to start playing with REW, so hopefully I can have the same positive result you indicated. Do you have any reading materials to suggest?