IPad 2 touchscreen calibration is off - How to fix?

I use my iPad 2 a lot to draw and I have noticed an area of the touchscreen where the sensitivity is not precise anymore.
There is a vertical area where even if I try to draw 45 degrees lines the ipad does a ripple.
I have documented the problem in two different apps (links to screen grabs):
Autodesk's Sketchbook
Infinite Sketchpad
I have visited the Berlin Apple store today and the Apple Genius told me to do a software reset and proposed to subsitute my iPad at the usual rates. I have tried to demonstrate the problem, but alas Apple will look only at software problems inside Apple's own applications and the problem does not interfere with the functioning of touch intensive apps such as Apple Maps for instance. It happens only in drawing apps.
I have followed all the steps indicated in the Support Article about touchscreen troubleshooting
I wonder if there is a way to recalibrate the screen and I am looking for the expert opinion of the members of this community. Should I pay to get a refurb unit? Do you see any other way to fix this?

There have been some known issues with iOS 6 and exsisting routers such as netgear, might want to check your router for a firmware update. Also some things you can try on the iPad is to reset network settings, Settings>General>Reset>Reset Network Settings, once your iPad reboots attempt to connect again and see if the issues still persist, also i would recommend powering off your modem and router for 30 seconds or so and powering them back on. No content or information will actually be lost during these steps. let me know how it works out for you.

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IPad 2 touchscreen calibration is off - How to fix?

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