Hello 
I did not yet try the bitsum software, only tried latency mon but there no problems were found.
It all started with C14.
I’ve tried Ozone 12 unlimiter plugin. As soon as I enable that, the sound stops. It doesn’t even stutter, it stops. The VU meters work, but no audio. In an empty project it works though, but the asio-guard already is at half. I run the steinberg power profile, I’ve enabled the “core park options” in energy settings etc
I have to set the asio buffer to 1024 on my RME UFX fireface to be able to work, before it was set to 128 samples, asio-guard is set to high level.
Sometimes, if a plugin has a spectrum analyzer chart included, it stutters as soon as it’s enabled, if I hide it, I can at least listen to audio.
(talking about projects with a backing track and 3 to 5 vocal tracks, nothing special)
To disable cores I use taskman → details → affinity
e.g. uncheck core0 and core1 or the E-cores at the end of the list. Cubase stutters for a moment and that’s it, the checkboxes are checked again soon as I view affinity again.
I will not disable the E-cores in bios and I also use the intel settings for the CPU which should prevent the intel “bugs”.
But, I have to mention I use Win10 because I actually hate W11 with all its dangerous updates
and because I don’t want to spend a month to install everything again 
Oh, just running Cubase after a fresh boot makes no difference.
I mean the appdata folder that contains the 3 standard folders (C:\Users\(username)\AppData)
The files are 2 bytes each, no content and appear every 60 sec if Cubase is started.
C14 had some weird changes, for example, the mixdown of a song is faster the higher the asio buffer size is. With C13 and lower it took some seconds to mixdown a project, now it takes longer than the song itself :o
I started with C7 I think, or whatever the version was in 2007 