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[simoncn]

1) There is no "optimal". Higher resolution isn't always better. It depends on how the DAC works and also on your room and your ears.
2) MinimServer doesn't know what renderer you are using. Only the control point knows this.
3) There is a UPnP protocol for a renderer to declare what formats and resolutions it supports but many renderers don't implement this correctly.

I suggest you work out what is optimal for your Linn and save the settings in a MinimServer profile named Linn. It sounds like you already have these settings. Do the same for your Naim and save the settings in a MinimServer profile named Naim. If the Linn and Naim settings are different, you can switch manually between the profiles when you change renderer.