Which pdf program are you using? I have PDF touch, but the writing feature is rather lackluster and low res/dpi.The touch feature should auto turn off when the pen is near the pro's screen. Which prog are you using to sign the contracts. I sign contracts all day in pdf and have no issues.
All of the office 2013 progs have pen input. You can even write in the body of an email with the pen. just hover the pen on the screen and you will see the pen options come up in the office 2013 products. pretty cool. I still think the inking - once set in the settings- Cust pens-pressure sense etc. - palm reject - is best in Win Journal- JMO though,oh nice, didn't know word could open pdf files or draw on files. Just tried it and it works well, although it sometimes draws my hands movement along with my pen. Still better than pdf touch though. D