Oncethe stroke is initiated the action accelerates with not enough control and thepianist gets a feeling of being disconnected from the keys. The pianistfeels that he loses control and a sense of weight through the stroke. Also, because this fly-away issue controlling pianissimo playing is difficultand must be done with the utmost caution in arm weight (I can tell this myselfas a player).
I would take a close look at the "magic line", and see if perhaps the capstan contact patch is moving through the line very early. If so, you have a decreasing action ration from almost the start. A larger knuckle will move the crossing point lower, possibly restoring a bit of control on ppp.
If capstan placment on the new keys is too close to the balance rail, there may also be a slowing down of the action due to FW getting the upper hand with the leverage.
Regards,
Ed Foote RPT
http://www.uk-piano.org/edfoote/index.html
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