Hi Troy:
Thank you for contacting Univ. of Illinois Extension Forestry for your black walnut question.
The absolute best recommendation I can provide to you is to seek professional forestry guidance from a local professional forester via an on-site inspection. It is simply too difficult, and impractical from my standpoint, to provide detailed answers to your question via this venue as this plantation is an investment and such an investment demands a hands-on approach via an on-site inspection and evaluation by a professional forester.
Please contact Penn State Extension Forestry for a list of professional foresters in your area of PA.
Best of luck to you!