Although a long has passed, I only recently saw this problem.
I checked the C++ code of the CharacterMovementComponent and found that when the player falls, it will use simple mechanics to calculate the falling speed (free fall).pls check:UcharacterMovementComponent::PhysFalling
Through this function, you will find that there is a limit to the maximum falling speed when the player is in free fall.(Check the function UcharacterMovementComponent::NewFallVelocity) The maximum falling speed can be directly modified through C++ or blueprint：
c++:YourCharacterMovementComponent->GetPhysicsVolume()->TerminalVelocity
Blueprint:The above functions and member variables can be found exactly the same in the blueprint
It may be too late to answer, but I still hope I can help some
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