I just want to add my experience regarding sapodilla as well. I am in Southern California. A few years ago, I had an Alano. It was small and had tons of flowers every year but no fruit set ever. About three years ago, I got a Makok. It's a bout 3-4 feet tall and is currently in a pot in because I have not found a good spot for it. I keep it in full sun exposure. It has lots of flower set. After two years, last year, it has one fruit currently about the size of an egg. This year, I am more diligent with watering. It now has 7-8 fruit buds. I don't pollinate by hand. I don't know why it behaves this way. I just want to share my experience.