Your thinking on which sex to pair is backward. I doubt the ball would have too much affect of the chondros eggs size but you never know. In my experience, male chondros will breed a rope if it smells like a female. I'm not really sure where this myth is coming from that chondros are difficult to breed. They breed like cornsnakes. The difficulty come with getting eggs to hatch and getting babies to survive. I would choose to go with a female ball just due to the hardiness of their eggs and babies.