Braking deceleration (while walking) makes you move like you're on ice, but not slide down hills.

As the title says, I’ve found that if you turn down things like ground friction and braking deceleration you can make your character slide around like their on ice. The problem is when you introduce a slope and the character doesn’t accelerate on it nor slow any… slower… when sliding down it. You slide up hills at the same speed you slide down them. Is there a way to change/fix this? Any help would me nice, thanks.