Weird physics behavior on inclined surfaces

Hey.
I try to make a marble game, during this project, i’ve tried to not use the physic ball simulation.
I’ve made my own character like this Screenshot

327911-structure.png

The sphere is my collision shape, i’ve the ball inside who si the mesh without any physics.
The sphere doesen’t rotate, I’ve made a rotation effect just on the ball, i use acceleration to make the roatation effect. But my physic shape doesen’t rotate.
There is my pawn movment details:

To control the camera, the player use the mouse, I have used the add Movment Input to move my ball.

This works verry well but there is two problems when my ball is on inclined surfaces.

  1. The deceleration is really lower, for the same speed, the ball stops on a length 10 times bigger than on a horizontal surface. Even if i go up.

  2. When I go down, the ball is like pushed to the bottom. It’s really weird. If i go down on an inclined surface to a fall, my fall speed gonna be really to high.

I’ve made a demo clip.

I hope that you can help me I’m really stuck (Stepbrother lmao) for weeks.

I’m not an english native speaker, so please consider my apologies for the faults.

Thank you !

UP PLEAAAASE