As far as I’m concerned with your issue, this has already been reported to WD to fix it by adding an option to force using core DTS from DTS HD-MA tracks in case of using A/Vs which has no support for HD tracks.
I might not be right, but currently there is no sollution for you unless you re-encode your media files (most re-encoding software has option to save DTS core only out of DTS HD tracks; mkvtoolnix, tsmuxer)
