ok ok, now I understand better the issue. to me it seems that the issue is not TVAI quality issue in v3.x as how the filter(s) work (i.e. Proteus 3), but the final encoding of the H265 in TVAI 3.x
that is strange, when i choose Auto in NVIDIA h265 in TVAI it always outputs at around 16mbps for 1080p upscale. Honestly i never upscaled x4 to around 4k, so i don’t know what mbps I’ll would be getting there.
in order to be sure that the issue is the h265 encoding that effects your final quality and not the Proteus 3 in TVAI (in your installation of course). please try to upscale with lossless (to approve or dispel it is only the mbps and not a combination of mbps and something in TVAI v3.x) and see if you getting roughly the same “bad” quality or you getting a good quality like in v2.6.4
to encode with lossless follow this short process (it will take you exactly 3 min of your time to set it up in TVAI, then you can use it as many times you like with one click).
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