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Interesting, I have had a similar experience. My tank is running nitrate and phosphate limited (NO3 and PO4 not measurable on testing kit). I saw my sps were losing color. I also have cyano mats on my rock and sand. I decided to start dosing 2ml of sodium nitrate solution I mixed in an attempt to raise nitrates. I could not get a reading for nitrate so I started to increase my dosage to 2x daily and eventually went to 2ml 2x daily. I could never get a NO3 reading but what I did get was my sps started to show signs of tissue loss. I have stopped dosing and still have cyano and no measurable NO3 or PO4.
I bought some Flourish Nitrogen by Seachem which does contain urea but it also has potassium nitrate. From your conclusions it sounds like I may end up with the same results.
Reading on doing some produce source research I found Urea .99% pure link