@angelar
Hi buddy.
The touchpad is absolutely the only thing that disappoints me with this system, it's jumpy for me during small motions, almost unusable TBH.
I don't think what I will say might help you directly but let's give it a try:
Did you already tested re-seating your keyboard+touchpad ribbon cable?
As you already know it's easy to find when removing the keyboard.
Also, have to tried different drivers (which doesn't really make sense but who knows)?
I use these drivers directly from elantech atm:
http://support.asus.com/Download.aspx?SLanguage=en&m=Touchpad&os=30Please keep me updated with any results!
G46VW | 3740QM @3.7GHz (All cores) | SanDisk 960GB SSD | 16GB Kingston LoVo | GTX 660M | GTX 970 via Thunderbolt