I've actually looked into this lately, but I only have hypotheses.
My guess is that you won't be able to fix that. As long as the cubies are not pillowed, you will always get a more crispy sound. I'm not entirely sure why though. An excellent example of a cube with a more creamy feel would be a type F.
Every cube that I have that make sure of non-pillowed cubies have a more crisp feel to it.