North Carolina Due Diligence Period

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Hey All, After listening to just about all of the podcasts I've finally joined the site and happy to be here! 

I have recently moved to Charlotte, NC and have found out about their due diligence period which requires I put money down that I will not get back if I back out. I am curious about a few things which are listed below:

1. Can I change the agreed upon purchase price of the home during the due diligence period?

2. If the seller didn't disclose a key issue with their home on the seller disclosure form and knew about it can I get my due diligence back? The reason I know they knew about it was because they mentioned it in passing but didn't bring it up as a real concern and since it wasn't on the disclosure form I assumed it wasn't a major issue.