Of course, Workhorse would be my first place to ask about this.
I have to surmise that the second set of holes are there for that very reason. Whether the second spring (or both springs when using two) need to be smaller, I can't say, but knowing Shawn's aversion to paying full OEM prices on hardware, why not look for springs that fit the bill at a hardware supplier? Just get two and try 'em.
btw, I recently added the Spring Safety Covers to my press, and they won't clear two springs, and in fact require the standard springs to be mounted in the inboard set of holes only. Smaller springs may permit the use of both sets as well as the covers.