In the wild they have the option of leaving a crowded burrow. You, yourself, said you were having feeding and behavioral issues since housing them together, yet, you also say that you are being hard headed and want someone to justify that it's in the best interest of your snakes to separate them. Well, the fact that you even had to start this thread is your justification. You also said you had the space and means to house a clutch of babies, yet you seem unwilling to separate the adults to even see if the behavior will change. The best advice I can give you is to sit down and contemplate what YOU think is in the best interest of your snakes. Because, for better or worse, you will have to live with your decision...
Rob