I've never had problems with my ball hair. In fact, I shave it almost daily and have never once nicked myself or gotten ingrown hairs. As far as the rest of my pubes…yeah, you just have to wait a few days in between shaving. That's the best advice I've got. However, I did read on Reddit, during an AMA with a stripper, that if you shave and then rub unscented dove deodorant/antiperspirant over the area, it somehow prevents ingrown hair. I've yet to try it though....
EDIT: Oh, and of course, go with the grain...not against