Angled func_conveyor

So I made this waterfall that's angled in the XY space (rotated in Z axis if it's easier to understand) and I thought it would be easy, so I just put the normal Pitch angles for vertical water flow.
I tested with a bunch of angles and nothing worked, the water just keeps moving horizontally so I begin to believe that the angle of the conveyor makes it too complicated.
Is there a way I can find the correct angles or should I just try and incorporate a non-angled waterfall in my layout?

The pitch, yaw and roll doesn't work for func_Conveyor. You need to rotate the texture in the direction you want it to flow/move. Just take out the texture application tool and rotate it so the yellow line is pointing towards the desired direction :)