I have seen that thread, good info. Yes I tried B&W also, and yes I'm looking at everything, from all angles, in different light. i still don't see anything - they are all perfect.
I had two more people over last night, ran them through the test, AND my wife again. I rearraigned the picttures without her knowlegde, and this time she validated my opinion. She picked the 'normal 300dpi' as the best, thinking it was Best 600 from the other night.
No one could pick which was the correct order or even which looked best, especially after the found out the real order.