@jerrybj not exactly apples to apples with your use case but…
I was using Mac Mini as a Roon Core for years. Not bad. Recently picked up Roon Nucleus One and actually prefer the Nucleus. I was shocked to hear the difference there and even more shocked to hear the improvements with better Ethernet cables on the Nucleus (for Mac Mini vs Nucleus comparison both units were fed by the exact same cables).
So I would say try the Nucleus and see how you like it. I think Roon charges 15% restocking fee if you return it. I’d look into it might be worth a shot to free up the capacity in the Antipodes. It could have a positive effect on streamer performance.

