Okay, the formation of my N-Chloramide is almost complete.Did you get the cyanuric acid precipitate as per the reference?
Just read the reference you posted, this looks really promising... *Runs off to find some TCCA
EDIT: by the way, I have always used heat for the rearrangement. Incidently the time I got the highest yield of ~25%, I prepared a separate solution of ~70c base, dumped it all into the reaction and then heated to bring it to 70c.
EDIT: Just noticed the same reference, uses sodium bisulfite to convert the N-Chloramide back to the amide. Surely this would lower yields when the same reagent is used to quench excess hypochlorite that seems to be mentioned in the other refs? Could explain why I got so much amide precipitate last time I ran this.