Odd that you are seeing problems with 192 files in Source:Five and not with 96/88.

The Core (i.e. MD600) converts 192/176 down to 96/88 so as far as Source:Five is concerned, it's seeing no different than receiving 96/88 audio.

If you are wanting to upgrade because you want 192/176, then you may suffer same problems after you upgrade. Sounds like a more fundamental issue than simply old vs new kit.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).