I have the same problem with my phone.
That happened because the touch screen controller chip get flashed somehow during the installation of G2FW rom to a G2F TW, and now is working with lower resolution of G2fw phone... So far i didn't find any solution, reflashing the software didn't help.
Probably the situation is similar like here: forum.zopomobileshop.com/thread-964-1-1.html
and if we can find a suitable bin file for our phone this solution can help.
As far i know that my G2F phone has got a ft5316 chip, but i didn't find anything for it.
The chip is build on the display connector, so probably if we change the whole screen module to new one it will work properly.
Anybody got some new ideas how to get the touch screen work good again?