As per our conversation on Discord.

At the moment, the spirit crafting recipe type does not display nicely in JEI if a recipe has more than eight additional input items, as the ingredients will go off the screen. (Refer to the Image 1.) However, I believe this can be improved. If you look at Image 2, there appears to be enough room to create another column just to the right. We need not worry about the left side of the recipe viewer since it can only display spirits, of which there are about seven or eight in total.

Here's how I'm thinking this could work: if a recipe is detected to have at least nine and at most 16 additional input items, a second column to the right will be created; and if a recipe is detected to have at least 17 and at most 24 additional input items, a third column to the far right will be created, while everything left of the columns (spirits, primary input, and output) will be shifted slightly to the left. I'm unsure how any items past the 24th slot would be displayed in a visually-appealing manner.

1. Current issue with the recipe viewer.
   

2. Screenshot showing extra room.