I also think the key action is too heavy. I think the key travel distance is too deep for my
taste, too.
What I did was shorten the key travel distance by an eigth inch. I did this by attaching
pieces of rubber (which I carefully cut to size) to the key stops. The shorter key travel
allows me to play much faster than I could with the standard keyboard.
As for getting rid of the stiffness, I took a screw driver and twisted the springs open until
I liked the 'feel'. I twisted open each key spring at three places - that yielded a touch that
feels very much like an old Hammond [sp?] organ. Hope that helps.