If anyone is interested in this AMP or knows someone, I might be selling it and going all tube hybrid as that is my preferred sound signature at the moment. This could change if I discover the DAC in my chain was the bigger issue and I have better quality sound after introducing the D90, then I may keep the little THX.
EDIT: need more time to confirm but the D90’s presentation vs the SMSL-SU8V2 has made this amp more enjoyable and less fatiguing to listen to. I will do more listening more this next week to confirm but I may end up keeping this little amp after all if my initial impressions with it paired with the D90 are correct.