Shallow Well, Good for 15 Minutes, then takes hours to Recover

We have a Shallow well, I was told it was 50-60 Feet, but upon measuring it, it is 30 feet deep, the water starts at 19 ft. (so about 11 of water). The well is 3 foot in diameter. There is a 40 gal. ballast pressure tank attached, it only has 4-5 gallons though from looking at where...
Shallow Well, Good for 15 Minutes, then takes hours to Recover