stuck

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I was asked to regulate a Steinway B. What I found has me stuck. Two things.
When the hammers drop after releasing the keys they hit the top of the back
checks. Hammers are bored to factory specs. Checking is very good. No amount
of  repositioning the back checks seemed to solve the problem without
compromising their function. The sesult is a slight "bump" feeling in the key-
like you get when the under lever stop rail is set too high and the dampers
bounce.
The other problem is the jack. With the dip at .375, blow at 1 5/8", the back
of the jack is being pressed into the cushion in the back of the balancier
window. It is literally captured between that cushion and the let off button.
Increasing either the dip or blow distance makes the problem worse. At these
settings the action functions and feels good to me. I've done a lot of
regulating in 22 years and I'm still learning, but I can't make sense out of
these problems. I've seen the hammer problem on a Steinway D once and the jack
problem on a Kawai GS 60. What have I missed? The college is trying the piano
today and I'm calling them next week for a report. There is evidence of other
techs attempts to deal with this piano and the current tech is smart enough to
know its over his head. He's grateful to find some one to pursue the problems-
for there are many Steinways on the campus and in town that have no one to
service beyond tuning and some regulating.  Am I standing too close to the
trees to see the forest?

Paul Chick RPT