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OK. So there is some coherence in this issue. The first thing is to check the NMJ4558 (or what you changed them for) and the sockets. Also try swapping IC4 and IC5.
Concerning the general velocity issue, are you sure that it is linked to the keys themselves ? That is, if you hit the same key a few times in a row, is it always silent (or always "brutal") ?
Concerning the contacts of the keys, they have a frail part easily overlooked. There is a thin (silver ?) wire on each metal strip that is used to make the electric contact. On my unit, a couple of them were broken at one of the tiny holes where they go down. One was up and acted like a spring. These keys were difficult to play. You could check all them with a strong magnifying lens.