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That was me. In my particular case I found that performance and mileage decreased over a 10,000 mile interval to the point of having misfiring under load. After changing back to the standard NGK plug all of my problems have disappeared.
The thread in question: http://www.600riders.com/forum/fz6-technical/44482-poor-mpg-things-not-always-they-appear.html
I knew that!!! Actually I remember the thread obviously but not the poster,
You didn't happen to check the gap of the iridiums when you took them out and see if the gap opened up some (with wear and tear)?