Tom it does look like a faulty piston, and for the record my plugs look like that with a white chaulky look to them after I run it and park right away, at idle it richens up and turns them a different color.
I would be cautious though thinking the IC will solve all your problems. The IC obvioulsy cuts back on the chances for detonation but will make MORE power causing even higher cylinder presures.
For the record I have the baddest 3L
J/K 3000 miles and counting! When I get to 5000 I'll start thinking its all going to work well together
