Ninja Character - Dynamic gravity for characters & objects

Hey, Im a newcomer to Unreal and I´m trying to use your plugin for a project cause I found it extremely cool. Im having trouble with 2 things. Im using the Unreal´s sidescroller template for movement and when I try to walk around a sphere the character doesn´t work properly. It finds trouble when the character is completely parallel to the ground and idk how to fix it.
I would like it so when the character Z vector is positive I can move to the right with D and left with A, and the opposite when its negative.

The second problem I have is when i try to change it´s gravity in the Z axis. I have the following code:


It works perfectly but only when the player is jumping or in the air, not when he is grounded. I would like the gravity to change whenever he is.

Thank you for any help.