Ok, so I went to a couple of experts here - they both said the not ripening is weather related. Can't image the weather is that different from your house to the fields down the road. Maybe I should qualify that to say they both said that problem is usually weather related.
Watermelon do like loose soil, but it needs alot of organic material.
Composted cow manure is the answer - (of course in WI what isn't that the answer to) If your watermelon are stressed by heat and trying to get nurtients, they will give up and turn their energy to seed setting, so you get non-ripened watermelon that have decided their life cycle is complete. Giving you the ripe look and sound. (that would be me parapharsing what they said)
Your watermelons sure look good. I bet this year they will be super sweet.
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