The Ampico "Concussion Regulator Springs" are actually called
"equalizers," but their purpose was actually hypothetical, in that
they were placed at each end of the stack for one purpose-- to act as
a tiny little reservoir at low intensity in case of regulator valve
overshoot. They didn't "equalize, and they didn't "concuss." They
just bounced around at low intensity.
So it doesn't matter that their springs are a foot long or 4 inches
long. The purpose is served. They effectively did nothing. The
regulator valves to my knowledge didn't overshoot (I have never heard
it). I have also removed the equalizer spring and left the bellows
attached, just to see if, on the most sensitive of rolls I could tell
a difference. I could not.
Sometimes designers have extraneous things designed in that they feel
are very important, when actually they can be safely removed. The later
model A Ampicos often excluded the "equalizer pneumatics," and that's
when the competition was getting keen for greater realism. I recommend
removing the springs, which takes them out of the expression circuit.
Otherwise, they actually smooth over small nuances that you would
otherwise be able to hear.