Until the entire action is all Plastic/ metal (hello Kawai ) there is no way to get every tolerance even across the whole 88 and to the tenth or hundredth. Then the keybed/frame/case is still wood, messing up things, plus humidity. If your customer is that sensitive, we should be invoving them in the final results, testing different aftertouch depths, etc... This is an interactive machine(instrument), It has to be ergonomic to be pleasing. My fingers are different length and different strength than yours. I like deeper dip, and can play hard. Give me a short dip like many factory settings are and tiny aftertouch and I will make you re-do it. Get to know your customer first, then see if the factory book says those settings will work on their piano. If yes. go! if not, explain to your customer,and re-test. They will love you for it and will not want to lose you once you know their " favorite feel" A computer needs every "1" and "0" in place to work right, the computer customer has no choice. Our customers have some choice, its their piano, let them have it. Best Regards to everyone. Steve
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