The settings listed on this page are the ones we used for the TCL FS3750 review.
We used the 'Movie' picture mode to get close to our calibration goal which give a warm picture look. 'TV brightness' to 'Brighter' allowed the use of brighter values accessible under the 'Advanced picture settings' menu.
In our totally dark room we used 'Backlight' to 0. Increase this value to adapt to your room lighting. This won't affect picture quality. 'Contrast' set at 100 allowed the TV to get a little brighter without affecting picture quality. 'Color temperature' is set to 'Warm' but can be changed to a colder setting if you find the overall picture too yellowish. 'Game mode' didn't changed much the input lag from our testing.