Need help for the character controller??

I am writing a player script by using character controller. The character is a bear siting on a snowboard. Therefore, I need to make the character move really fast. However, when I set the speed really high, the character is started to be “bouncing”.

I understand that is because I set the speed to fast, but is there a way that I can fix this problem with character controller??

Thanks guys, any comments would be helpful!!

If you want the bear to go down a steep slope I suggest you :
-set the bears rigidbody to kinematic ( so no gravity and so affects it )
-set its rotation to be same as the rotation of the slope
-make its movement parallel to the slope
-create one more script that moves the bear to the direction of the slope ( so it cant go airborn near the slope )

It is pretty complicated with a lot of math. Alternatively you can do some camera magic and avoid using a slope at all.

you advise inspire me a lot. Thanks you very much!