Use your favourite registry editor, go to [HKLM/Hardware/Devicemap/Touch]

Modify the value for Calibration Data to 519,503 177,881 182,129 847,127 849,872
Modify Click from 1280 to 2000 (decimal)
Modify DownUp from 256 to 750 (decimal)

Save the changes and soft reset the phone for the new setting to take effect!

P.S. The original data are derived from screen calibration when you touch the 5 points. So basically you dun really need to backup the original data this time, as you could always recalibrate the screen if you dun like the new setting.