Hi Maui,
The Random part of your set up moves the sprinkles already down (for some), which was the duty of the Linear Field. In return, the Linear Field has not so much to do anymore. The Overlay, means, that the effect on lower values is like Multiply and above middle value, it works like Screen.
My suggestion would be to adjust the shape of the Linear Field Object> Attribute Manager> Remapping> Contour. (See screenshot.)
In that way the sprinkles start falling slowly but have a good speed close to the floor, not landing on a pillow anymore.
Scene file and screenshot:
https://www.amazon.com/clouddrive/share/DbH6wlF94p9VuANAo6sJR8q2SfAwyjjZJpUfqbbuc5M
Let me know if that works for you of if we have to look into a different setup.
All the best