Thanks for that feedback.
In a wooden shanks action, the shanks are more or less 'voiced', ( a too short tone can be made better by scraping the shank) the mellow ones are avoided, the harder ones are in the basses, and the evening of the resonance of tone even visibly a part of the tone which is heard (the raise in evenness is well noticeable between a non scraped shank set and a scraped one)
The tone of the WnG shanks is even (from note to note) , but a few ones could be adjusted. we where not yet there, the piano is now regulated so better tests can be done and an eventual tone difference checked..
The only time I've ever noticed the voicing of hammer shanks has been when it has been uneven. A well scraped shank set will have a shank tone that doesn't stand out, is lost within the tone of the instrument.
You use very muddled terms to describe this kind of thing, Isaac, so it's difficult to understand quite what you mean. My perception is that the shanks contribute two elements to the sound - one is the broadband, unpitched noise of the impact that is just a part of the sound of many other components of the action together at fractionally different times (ie keybed noise etc). The other is the pitched, resonant element to the wood's sound.
Is it the pitched element that you are talking about when you talk about scraping the shanks?
If it is, then ideally you would want the tone frequency of each shank to correspond to the note being played. Is this something you have seen done, or done yourself?
Most of what has been said about sorting and scraping shanks seems to be about dividing them into categories - keep/reject, and then bass/treble.
It seems to me that any tuning of the resonant tone of the shanks is done not to bring out a particular tone, but to mask it as much as possible, and to create as even a contribution as is possible from the wooden components of the action.
I'm not so sure that this tone contribution is desirable, as it seems to me that it will inevitably be uneven, even with careful scraping. Much more uneven than, for example, a duplex scale. And those can be very uneven, even on top class instruments!