Your not going to find a whole lot of support on this forum when making hybrid animals. Husbandry is different for both animals and you shouldn't house two balls together never mind a ball and a blood. Blood Pythons are more territorial and aggressive than ball pythons and you will probably end up with a dead ball python on your hands. Bloods are a much bigger species of python and shouldn't be breed much before 10lbs, were Ball Pythons can be breed at 2lbs.. When dealing with adults; balls usually fall under 10lbs, where bloods are often 3x that weight. Making Hybrids is very difficult, dangerous at times, and time consuming. They are not really sought after on the market or widely accepted in the community.
Cheers.