Willem, I don't know about the hammer line question and I'm sure this info is too simply and has already been checked BUT I would make sure the key height is 2 21/32" from the top of the keybed to the top of the key and the key dip for ....I believe you say a "B" should be .390....just a little more than 3/8". Now, those various hammer distance measurements sound real "fishy" to me. The line is just too crooked. What do you think? The quy that hung the hammers may have hung you out of dry on the backchecking. Let us know your final diagnosis. Thank you Tommy Black Decatur, Ala.
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