I'm getting results similar to your tests above with the exception being that I'm actually getting DTS-HD passthrough on VLC and still none on Kodi. You may have forgotten to enable "Digital audio output" in VLC's preferences as it's not enabled by default. I also only get multi-channel output on some of those files when it isn't enabled.
As for Kodi, I've uninstalled 17.6 and installed the 18 Leia Alpha but I'm still only getting DTS-Core coming through to my Onkyo reciever. Could I ask what your kodi audio settings look like? Do you have the "TrueHD capable receiver" and "DTS-HD capable receiver" settings available on expert mode?
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