Hi TheTrice,
The reason for the 200 cm/s velocity bounce that you’re seeing is that PhysX has a minimum relative threshold required for an object to bounce. PhysX recommends setting this to 0.2 * gravity which in our case is around 200.
I’ve exposed this setting so you can change it. The change is available on github:
https://github.com/EpicGames/UnrealEngine/commit/56df61a3a2811ca397369ceec56c421e9dd7db9c