Adjust touch parameters

I have some problems with my touch in my lenovo phone. For example, when I touch in two places that the distance between them is less than 2 inches, the phone thinks that it's only one touch. To fix this and more problem with the touch, I need to know how to change some parametrs of the touch. So… Do you know where those params is stored or how to change them? My phone (lenovo s8+) is rooted, and I have terminal emulator on it.