I’ve not had any issues with Qobuz that weren’t caused by a wonky WiFi network about five years ago. And that wasn’t with Naim kit.
I assume you are all up to date with firmware and your 555 is wired?
For matching releases I’ve not been able to tell any difference between Qobuz and local streams although your system is a lot better than mine 
I do find that Roon levels things out though, effectively Qobuz on a Roon fed system is local.
No problems with my Qobuz down-steaming recently. All working fine. 
Last time I looked I believe there were other CDN providers in there as well for Qobuz. I know Tidal uses/has used Akamai for some of their CDNs. Certainly Akamai powers a sizeable part of the global media distribution on the web.
Actually underneath the covers they are identical in terms of media - however Qobuz like most other streamer service providers require more streamer processing - unless you use a proxy. The http media transfers may be secure (https) compared to your local network and the encoding is FLAC as opposed to typically uncompressed PCM for local streaming…
Any audible harshness is possible from digital noise interference from the extra processing work load in the streamer. Digital processing and quality analogue audio don’t always make great bed fellows.
If you use a proxy like Roon - for the same master it is effectively identical - it makes no difference where the media is located in terms of SQ… its a great liberator for the music lover - I use local NAS stored media less and less now - it is increasingly inferior to what is in the cloud - as most of my NAS media I have come from CD rips… and increasingly 44.1/16 has become superseded… with the new baseline increasingly being 44.1/24
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