Make sure your links that you build look natural. Not all sites are PR4,5, and 6. It looks like you bought a package. Get some standard links. Get some regional if possible. Some low PR. mix it up. Just not pure junk or link networks.
I've never bought links, one of my affected sites doesn't even have link exchanges. Just natural links people have added over the course of 10 years. That site is older than Google is.