Venus over-exposed using USB Camera Pro

Yesterday I gave the first light of my new SV105. I connected it to a Samsung Tab A tablet using "USB Camera Pro" software. I tried my first photo aiming at Venus by my Nexstar 4SE, using "USB Camera Pro" to control the camera.

I was surprised how big Venus appeared on the screen.

Unfortunately the image was quite over-exposed.

I had to reduce the brightness, contrast and the gain in order to obtain a reasonable silouette of the planet, but the image is still a white spot with no shading to the black along the terminator line that should show it.

Could it be a problem related to the poor control of the camera allowed by the software? 

Does it exist a better software for Android?

Have you any hint?