So, I checked this my HP Omen Laptop as well and the problem does NOT appear there, there GPU-load dances between 0 and 2, sometimes remaining on 0 for a bit. The NVidia driver on this machine is 27.21.14.5167 and it's an RTX 2080 Max-Q (instead of the Quadro RTX 5000 in the ConceptD) The Windows version is 10.0.18363 build 18363 on this machine. I think the last windows update failing an reverted automatically on this machine, which is why it doesn't have the same version. On this machine I never had any problems with Unreal or Blender as well.
Btw: I updated Windows and the NVidia driver to the latest versions in the last few days + I'm on the latest version of the Reallusion software Windows 10.0.19041 Build 19041 NVidia 27.21.14.5206 These updates had significant effects on the system. Since I made these updates Blender and Unreal Engine are running muuuuuch better. Before Blender was kind of unusable, feeling like being in slow-motion. Since I updated the system doesn't come back from hibernation properly however, as well. I'm just mentioning this because obviously these updates had an effect on 3D performance for these two applications and therefore could also have an effect on iClone and CC.