FWIW the pictures indicate your engine might be running quite a bit rich. Mine is tuned to run rich but the insulator remains mostly white. I also stripped one of the wires when changing them out with Iridium ones a few weeks back but it's not a difficult fix.
It's pretty pointless to change them often, and since you had irridium in there, they should have been left alone. As long as they are the correct heat range, there won't be any problems with them.FWIW when Rylan tweaked my VV with cams pipes tuner dyno et al he changed the plugs.. I asked why, as they were iridium and pretty new, and he said as hot at these motors run he likes to do the plugs often. and he put in OE plugs, not iridium. They are inexpensive, it's easy to do, and the engines generate a lot of heat, so why not? So I have gone back to OE plugs and change them fairly often. again, FWIW...
Disagree as you will !95000 same plugs and they look great!
Seems alot of folks are happy to keep the spark plug economy rolling! My second bike the Vegas 37000 and I might check them once every 10.000 maybe not!
I prefer rideing ! That's just me though!