The stream resolution can be set in VRidge settings. The pixelation is due to the limitations in bandwidth. You can try to increase the bandwidth from Vridge settings. But usually it is limited by how much your phone can handle. Even if you use USB 3 card, the phone may not support USB 3, so you may be getting lower speeds.
Reduce the framerate if still seeing pixelated. It's a compromise, but using a phone as VR headset is always gimmicky. Don't expect smoothness anywhere near a real VR headset. I couldn't manage it to drive anywhere near how you would on a screen, as the latency and stuttering is too high. But, It's nice to have the experience
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