Well it looks like Google got itself straightened out. I did go in and reduce some of the keyword density and sent 3 backlinks at the URL targeting the keyword. But backlinks and changes to content don't just shoot back to number 1 again as this did, it is usually gradual and with a lot of bouncing. The drop out of the 20's around 5/5 was after I changed the keyword density. A drop, then a gradual rise is pretty normal when you change the content. But jumping from 37 to number one as I did on 5/13 is not normal. Then to have it flatline at number one is even more unusual. In any case, I am happy to be back at number 1.