Hi,
I can tell you my experience, it's not exact the same application, but you should try it.

The 218 is a decoder, not a renderer in your case.

First remove the renderer selection in Roon and then you have two choices:
a) Select the 218 as decoder and thats it
b) Select Roon as the decoder (via the builtin sw in Roon)

Then you can compare whats sound better for you in your case, but leave renderer unselected.

Noise problem:
a) In ROON select on the right lower corner the speaker/audio device symbol.
b) A new tab appear, select the tooth gear symbol.
c) A new tab appear with "Zone name" and "Audio device"(here select "Device setup")
d) On the "device setup" tab you can select TWO controls here here --
---- 1) "MQA capabilities" (the capability of your 218 is asked here) and select "decoder only" as described above
---- 2) "Resync Delay" (It will help with your noise problem) and change from "0 ms" to a longer time eg. 500ms
---- That option mute/delay the output when formats get changed-give the 218 time to synchronize

Here are more here, but I am not on my audio.
The adjustments should help you, if there is still a problem with noise then try to switch MHR off, but I guess that would not the case.

Good luck
Robert


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