Dropping back in here to give an update. For my specific case, turning of HVCI/Core Isolation in Windows resolved the remaining stutters. There were events 2 and 5 in my event viewer that correlated with each stutter from "IsolatedUserMode". iCue was the first issue when I started troubleshooting this at the release of DT, and I had Core Isolation disabled on that installation of windows, so I'm assuming that since fresh install of Windows 11 leave Core Isolation turned on by default, that was the source of my stutters post-fresh install. I disabled it and I haven't had that event show up in 11 days, and have had no stutters since then as well.