I would be tempted to leave your system alone for a while and give it a good test before creating new phantom sources. It will be much easier to troubleshoot if something goes wrong down the line.

I would start by testing sources and DSP with app and MSR.

If you really want to go further now, I might consider a rollback to pre 218 to see if your customisation worked as intended before the 218 was introduced. You may still have some commms issues.

Main: G61SL, 218, HD621, 2*7200SE, 7200HCSE, M6s, DSW, Apple TV 4K, NUC (Roon server)
Secondary: Wiim Pro, 3200, Audio Core 200
F80