‎​It turns out I had modified the peg depth, so this new model sits flush with the matrices.

The matrices taper from the front to the back, so my initial measurements were incorrect since I measured the back and didn’t account for how much space the front takes up went sitting next to each other, so I added a little bit of extra space. I also tried tapering the models edges to match. It’s not perfect, but I think it’s close enough!