Thank you for your hard and time consuming work.
It seems, that I'm the only one with that twin problem.
I have that problem since seasons and has nothing to do with the family-aspiration benefit. I never take that special benefit.
I had my games totally ( 2x) new installed since that problem occurred, maybe my Sims are special blessed with fertility.
Since nobody else is nagging about that twin problem I suggest that you drop that part of my request and maybe you can take on the part that juices are less filling ( normal snack filling without any bonuses)? Preferred juices to be tweaked are:
apple
orange
orangade
eggplant