Ingots, Sticks and Plates are not Materials they are Shapes, I asked for Materials. 
As for the Shredder, just to make sure you did it right, here is the order in which to do things:
Step 1: Remove Recipe for X to Dust
Step 2: Add Recipe for X to YourItem
If you did that in this order and it didnt work then there might be a Bug.
Edit: if it is what I suspect happened, it might be MineTweaker removing the Recipe wrongly, so that its no longer in the List but still in the HashMaps.