Yeah, its glasses for 0. I was being ignorant and didn't check the entity guide.
-1 aint working? Maybe you are having real bad luck with a monstermaker and just have gotten a huge stream of glasses?
No idea why its not working, but if all else fails, make 4 monstermakers, one for each sci body, then trigger them in a random (sorta) order to get each type of sci? Might work, sounds like an awful lot of work for that though.