Rob Buskop mentions he has a 60 gram down weight which is "heavy"
[150324 MMDigest].  Your problem _may_ be related to "piano action
geometry."  You mention the "spread between the whippen flange center
and the knuckle center.  I worked for one of the largest used Steinway
sellers in the country doing action work.  I was his "go to guy" for
these type of issues.

I would start by thoroughly regulating the action and damper assembly
and removing all unnecessary friction.  If the touch were still too
heavy, I would check to see if lead weights were removed from the front
of the keys.  I would check the hammer weight.  Maybe the replacement
hammers are too heavy and weight can be removed by tapering them,
et cetera.

The bottom line is, the "right action spread" is the one that works
best overall.  If you increase that spread you gain more leverage and
a lighter touch, but now the jack may be jamming into the whippen stop
felt and you have no aftertouch.

I have a customer who has a 1925 Fischer Ampico grand with all original
action parts.  If you want to pay me to measure the "spread" I can do
that.

I would look at the capstan -- is it centered on the whippen cushion?
Sometimes, plugging and re-drilling the capstan holes further back on
the key is the best solution.  Poor shank or whippen match may be your
problem.  Sometimes you just need to buy all new parts.  Maybe a
smaller knuckle would work better than a bigger knuckle.  I would, on
occasion, cut the fronts of the balance rail punching in order to gain
more leverage for the key, hence a lighter touch.

Using good judgement is of the utmost importance because it [action
regulation] is _not_ an exact science.  We do our best.

Bill Maguire
Long Island, New York