So do I follow what all the tests tell me...or do I follow what this instructor is telling me and move to goofy?
I certainly would. It's his job to pay attention to how you ride and then correct the things that need correction. Plus, if you absolutely cannot stand riding goofy after trying it, it's easy to switch back to regular. No test can truly tell you which way to ride. You will know after trying both though because one will be more comfortable than the other.