Based on your results (and thinking different soil needs different things), I think I will try your test in the Summer '14. We are moving so I'd like at least one year "raw" for comparison. Now granted I will have almost exclusively raised beds (they warm up faster) and the rule is replace at least a 1/3 of the soil with new mix. Add on top of that that every summer I've been here has been different weather wise - drastically different!

I am really enjoying watching your experiment!