making character rotate correctly with slope?

so i made this function which should tilt the player to the surface below them, but if you rotate the character it does not rotate it normally, it rotates it in a weird way

function moveSet:setTilt()
    if self.humanoid:GetState() == Enum.HumanoidStateType.Running or self.humanoid:GetState() == Enum.HumanoidStateType.RunningNoPhysics then
        local ray = Ray.new(self.hrp.Position, Vector3.new(0, -3, 0))
        local FloorPart,pos,normal = workspace:FindPartOnRay(ray, self.character)
        if FloorPart then
            self.root.C0 = CFrame.new(Vector3.new(0,0,0),normal) * CFrame.Angles(math.rad(0), math.rad(270), math.rad(90))
        end
    end
end