It sounds like you are looking for someone to justify breeding the pair. You seem to know about the potential risks and have been told what the outcome would be. So obviously you need to decide if you are prepared to handle the potential problems that can occur with this type of a breeding. There is always potential for problems. You see a handful of Supers but how many were euthanized in the same clutches? There are sometimes things that you don't realize happening behind the scenes.
Are you capable of euthanizing an animal?
If not, are you prepared to keep and take care of an animal that might have special needs?
Black Pastels can have the same issue so there really isn't an easy fix. This is a potential problem with these types of pairings. You can either deal with it or move on to a different project/pairing. It sounds like you have the information you need to make that decision. You just need to make the decision based on what you can handle.
Regards,
B