.... dealing with hum issues for me has been a major major ordeal. not 100% gone...
A very interesting System. Just a few Thoughts about the hum problem...
Is the Lyra Erodion grounded? Preamp grounded?
Sometimes it can be also possible that some electronics react with grounding via the Power cable (+, -, ground), some (minority) work better without ground, or what is also possible, using only 1 ground connection and all other units are linked to that one (normally the preamp).
Happy Listening.