Tightening it up some didn't help the noise any.

Swapping the front wheel didn't help the noise any.

DMGs test leads me to believe that the headset is in decent shape and is tightened properly. There isn't any play in the fork and the front end turns freely with no binding. I tried tightening it some according to the park tool website, but I don't have the exact tools to get it perfect.

What else could be making that clunk when I jump a curb or hit a big bump in the road? Or should I get it checked out by a pro before I give up on the headset?