I know this was a long time ago but having come back to the spring from the lampi today, I think I now know what you’re talking about. Been noticing it on female vocals, in particular. It kind of inhibits the spring from sounding fully organic, but yeah it isn’t so obvious when you don’t have anything to compare it with.
Btw, how would you differentiate grain and harshness? I feel like grain deals more with lack of texture, while harshness lack of control or maybe resolution…