Use 4K cameras for better facial recognition?

Even though i use arcnet-cpu, and det-threshold of 98, i still get mislabeled faces outside. Partly this might be from needing more pictures (have about 80-100 per person, from different angles/light/etc) and partly because the resolution is to low (using 1080P) when viewed from far away.

Seriously thinking about upgrading to 4K cameras. Going from substream to main stream was such a big difference, and my inference speed event went down to 10ms on the coral TPU.