20/40 is pretty low pressure. 40/60 is more common for a house. But a high volume centrifugal pump probably won’t build any more than about 40. If you have the room in the well casing, I would drop in a little ½ HP sub or a shallow jet pump and get some pressure like 40/60 for the houses.
You could also add a jet pump as a booster. Pick you water from a pipe coming from the big pump, and booster the pressure from 20/0 to 40/60 going to the houses. The problem here is that both pumps will have to run at the same time for you to take a shower.