Maybe try boosting them with pupae instead of egg/larvae. That way the queen won't need to take care of them and all you and she has to do is wait for them to eclose for her and then she'll have an instant worker force without her having to take care of any eggs or feed any larvae.
I would do that but the queen died. I was trying to see how he workers would react to her if I set her by them after they had escaped into my hot-glue gun, and they liked her. They moved her back to the nest, my aspirator for now, and when I came back in 30 minutes, she was gone. More likely than not eaten by the queen. I cannot however see any pieces of her laying around. She may have just escaped through the cotton ball at the top. Either way, she's gone.