I used SEM Rush which if you put your URL into it, you will see you rank for over 20k in keywords
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Obviously it shows a sharp spike in your traffic so i am shocked to see your findings as a quick site audit does show that there is a lot of underscores in URLs and basically poor onsite SEO which you have obviously done for testing
I appreciate the screenshots as you know this game is all about testing and there is so much crap and mis-information out there and itds refreshing to see someone trying these things.
Since reading this im going to be doing my own testing on this theory too with a test site of my own as id like to see this for more competitive keywords .
But great test and hope you guys keep posting on the progress
"Confidence comes not from always being right but from not fearing to be wrong."