Hello,
Yes, with RAW16 the Min / Max values are converted to 8 bit to use less screen space and have a single 0-255 scale.
1) SER Video playback is a planned feature (will arrive in future)
2) You phone has probably slightly bigger text size and the word RAW is not displayed when the button has focus, I'll double check this behavior
3) Yes, this is a good idea. Now only frames and file size are displayed.
If both the "TURBO USB" and "high speed" options are active, the fps increase until they reach the maximum expected ones. But they fluctuate a lot, until they drop to "0 fps" with max resolution! Dropped frames also increase! It happens at high resolutions with 8 bits of color, and at all resolutions with 16 bits of color. No problems with low resolution frames with 8 bit colors.
I guess that Turbo USB is the same as USB bandwidth limit set to 100. This may cause trouble if the computer can't handle the USB traffic in realtime, because your camera doesn't have DDR memory to cache images and data that can't be received by PC will be lost. High quality cables can help a bit if Low quality cable are introducing errors and causing some packets retransmission.
You can try to disable the antivirus and any power saving feature of the computer to get the maximum performance.
It's an pretty old camera, last update 2013. My advice is to sell it and get a new, faster and better, USB 3 astro camera.
Thank you