I have it finally working, but only by using a completely different implementation which turned out to be incredibly simpler than the Hardy method. After days of googling to find the right info and resources, the method that worked for me came from this link:

http://www.navspan.com/ecommerce/fac...m#.T5CVKo6j1oM

Article titled "eCommerce, Facebook, Social Media Optimization, Web Design, Website Design, Zen Cart"

I hope this helps anyone else struggling with the implementation and issues of facebook not showing product photos.