Hello Holger-elf
Scrolling in Bridge has always been an issue because the Preview Panel jumps in quantum bits. Each image being the quantum part of the equation. This is complicated by the distance of each "scroll" amount sent out by the mouse. Let me make up some numbers: Let's say that when you scroll down 50 pixels worth but your thumbanils are 100, Bridge will jump to the next quantum bit of 100 pixels even though you only scrolled 50 pixels worth.
I feel your pain.
To complicate matters, have you ever seen a movie where the wagon wheels appeared to be going backwards to the direction of travel? This is an optical illusion where the captured video HAS gone forward the the placement of the spokes when that image was captured, is behind where it should have been if the wheel was going forward. This one causes me the most visual pain ("Am I scrolling backwards or forewards here????")
I feel your pain (part 2)
What I've done is to never scroll in Bridge, rather I grab the scroll bar on the right hand side and simply slide it to where I want it.
Yes it SHOULD work but due to the confines and structure as to how Bridge works, it doesn't work as well as we users would want it.
I write all this so that you can go off to Bridge's Uservoice and request an option to offer scrolling that doesn't stop on each image but rather lets the image stop half-way if needed.
https://adobebridge.uservoice.com
Sorry that this cannot be helped at this time.