How are you using Kindle Previewer to convert those 3 files? If you're just dragging and dropping the html file onto the Previewer, then your opf and ncx files are not going to be part of the resulting mobi—because the html file doesn't know of their existence. I don't know why the Previewer would work for that type of converted mobi where the Kindle touch wouldn't (except possibly because there's no Kindle Touch-specific emulation mode).
Anyway... just make sure you're dragging and dropping the OPF file onto the Kindle Previewer window rather than the html file in order to have the best chance of building a properly functioning mobi.
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