Is there any oil in the forks?
When you did the air pressure, did you use a hand pump as they don't require much pressure?
Are the yokes adjusted correctly onto the headstock bearings?

If you are getting the clang on the extension of the fork then I would suggest that there might not be enough or any oil in there.
Failing that the bushes might be shot.
I wouldn't worry too much yet, unless it's the headstock bearings.