First, I tried to swap in an MXBROWN spring, but without luck. The diameter is a little too large to fit into the switch.
Then, I removed the 2 dampener, put it together and got a super-tactile-smooth switch.
The dampeners are there to dampen the tactility a bit. Now I opened it again and left the leaf-spring away. I expected no tactility anymore. But the way the contact is closed gives a little bit tactility and now, the switch is super smooth and almost as light as an MXRED.

Edit: The thing with the dampeners is nonsense. I just tried. All they do is dampeneing bottoming out and topping in (or what it is called).