It was assembled wrong! There's this thingy, I flipped it the other way around, and now the boards go where they're supposed to!
Apparently the owner I was chatting with has solved the problem lol
I think it would feel very weird if Focus Shot was its own button. The way it is, you can just keep firing normally by holding down A, and when you need to slow down a bit, push C down as well. Feels very intuitive and natural to me and you never need to let your finger off the shot button.
In Fast Striker it was tapping the A button for normal shots and hold it down for focus shot. It didn't need a separate button.