The one thing that you want to do is to make each element have it's own physics air drag, bounce and density that will give each one a different way to fall.
Second make your static elements out of circles if you can it gives you more individual bumps on a surface and can create some interesting ricochets.
I kept the fill and stroke on the wall cells and then I removed the fill and strokes on the valve cells.
This way you can get the blood cells to interact closer with the curve of the valve drawing.
To see how those are built just ungroup a valve and fill in the circles to see how they are stacked.
I have also included 2 experimental pieces I made based on a Galton Box.
This shows how you can distribute the friction of the physics elements and also make them either float or drop.
You will notice a couple of balls escape and this is a bug in Hype. If the bounce is too strong and the static physics body is the same width or less than the width of your dynamic element the dynamic element will break through sometimes.
The big take away is there are ways to make your physics work for you with the basic elements.
Then save those structures as symbols or groups and reuse them later to speed up your process.
veins_2.hype.zip (31.0 KB)
Galton unplugged.hype.zip (140.2 KB) Galton DUO.hype.zip (78.8 KB)