I am going to be quite curious to hear what you finally discover the problem is. I wish we were neighbors, this whole thing would've been settled over a diet Dr.Pepper before it even happened...
regards,
Douglas

one more thing. Try and get somebody else to look at what you have done, it would appear that the 'bliders' are on, which makes it very hard to proof your own work. Please don't take offense at my bluntness, I mean no slight. Print out the basing diagrams and perhaps the teaching of the student inspector will illuminate the problem.