noisy Schimmel action

[Richard and Julie Capp]

I am trying to solve a couple of problems on a Schimmel CC208 (6'10").
 The piano is about 8 years old and is used by a teacher who teaches
very talented, advanced students.  When the keys (primarily C3-C6) are
released there is a noticeable "wooden" noise.  The action was
regulated and key bushings replaced about 6 months ago.  I suspect the
wippen cushion is the source.  Any opinions?

The other problem with this piano is bouncing hammers in the
mid-section.  Some will even double-strike on a mf, staccato blow.
The hammer pinning does not seem excessively loose.  I did the "swing"
test, but did not check with a gram gauge, and got 5-8 swings on
several of the hammers.  Any suggestions greatly appreciated!

Richard Capp