Ok, the problem MIGHT be that I just have no idea how to do key-pad combinations on R4CCE084.
I have all other buttons set to "pass-over", gray boxes, then L+A as the first 5 slots, L+UP as the next 5 slots, L+DOWN as the last 5 slots.
I got slots 6-10 to work when I set them to L+B, but for it...