Leopard geckos not eating enough

Two of my female leopard geckos are really picky when it comes to food, all they want to eat is waxworms.

I wouldn't call them skinny to the point of being unhealthy but I can't seem to get their weights up high enough for me to feel comfortable breeding them.

Does anyone have experience with overly picky leopard geckos? I'm worried that if I feed them more waxworms I will never get them to eat anything else and they will get obese.


I will just keep these girls as pets if I can't guarantee their safety for breeding but I really wanted to get some RADAR babies from them so I still want to see if I can get their weight up.