I think Durgan that you are missing a great opportunity to learn from each other. I am glad people like Tom Wagner takes to respond since his work is breeding potatoes and not grow massive amounts for eating.
I saw your potato pictures and responded to your posting about Yukon Gold. I remember asking what was the soil composition since I wanted to improve yields as well. Anyway the post was :
http://tomatoville.com/showthread.php?t=27546
Not completely sure why you keep being a bit harsh in your comments but let's try something different. Instead I would like to challenge you to try one on the long season indeterminate potatoes that are available in Canada and see for yourself. Who knows? Maybe you will learn something also.