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There are no 2160P broadcasts so if you want your TV to do the upscaling, do not tick 2160P in your V6 settings.
Leaving 2160P passthru in the settings will allow any 4K YouTube or Netflix to pass straight through to your TV.
PS There are no 1080P broadcasts either.
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V6 does upscale, when the 2160P setting is ticked, but, in your experience, it does an inferior job to your TV. This doesn't surprise me.
BTW V6 does a great upscaling job for my lowly 1080P, non-4K TV.