I think you are trying to do something that is not meant to be done using the default CharacterMovement.
The capsule collision is used by the CharacterMovement component which basically fakes/simplifies physics movement (to make things more controllable) which means there are no real rigid body physics going (hence the Simulate Physics is disabled by default on the capsule) so I’m not sure forces is the way to go.
That’s probably because the movement component is tracing below to detect the floor.
Again, the CharacterMovement component is meant for “normal” and simple character movement setups… so it will not be that simple (if you know C++ then I would highly recommend making a custom CharacterMovement component).
The CharacterMovement has a Gravity Scale variable so you could use that instead of forces (for example scale = -1 will reverse the gravity) but the walkable floor will have to be done manually I guess (I’m not sure if it can be done via blueprints but take a look at Walkable Floor Angle and Walkable Floor Z parameters… it is possible that this is all you need).
Quick note: please avoid posting this many images in the future 
it makes things harder for us to help you… instead try to keep the description as short and meaningful as possible, you will get more replies that way 