One more datapoint for the group here, but I'm experiencing the same problem, and noticed the same behavior. I then noticed that the ghost touching starts pretty much soon as I clip in the lower-right corner of the screen, near the lcd connector. The black PCB there seems like it has a lot of flex to it, and my theory something's damaged in that PCB from the flex.
I stuck a folded up sticky note under that pcb to provide some rigidity, and although the problem is not resolved, and I still have a bit of a weird unresponsive area of the screen, it seems to be an improvement since I'm not ge