Finally built mine yesterday. I would recommend anyone with this keyboard to remove the weight.
With the weight it felt as if the switch pins were resting on the weight resulting in a harsh bottom out. Not at all what I had anticipated with a PA plate. Moreover, the sound profile of the vintage browns was not what I had expected either. They sounded high pitched and harsh. Given the absence of flex, despite a very soft plate, I decided the weight must be too close for comfort, so I removed it. Everything immediately turned out just they way I had foreseen it with a pleasing sound signature and a nicely bouncy feel.
Great little keyboard, LZ!