Dear @Eshwar
Can you please send us some oscilloscope pictures of the 4 analog touch signals. This will give us an understanding how to optimize the settings for your case. Please have a look at the pictures below as a reference how the measurements could look like. I took them on my Evaluation Board which was equipped with a Colibri iMX6DL (default settings) and a 7" resistive touch screen.
Keep touching the screen
[upload|6Ti+RURzXBt7VKf2WISOrboy374=]
short click onto the screen
[upload|kCn9PcVoqmV/mO/WCCFXd87GiTE=]
Regards, Andy