Actually, to follow up, if getting a larger tank is recommended, what size would be recommended? a tank with 10 gallon drawdown so pump only runs every two minutes?

Run,

My $0.02 is that you work on pipe connecting two zone together. To get 80% of pump capacity. Get a controller than runs your pump on and off and the zone valves. Get rid of the tank or use it as a large pipe and get rid of the pressure control. Get a pressure reducer for your garden section and reduce the amount of water applied to match your lawn watering time. You will save wear and tear on your pump. Also look at getting larger irrigation heads that use more water for shorter time. That is it. JMHO aloha

My advice would be this. 55psi on a sprinkler system is too much. Find out how many gallons per min the system would run at say 35-40 psi. Most likely it will be more like 13-20 gallons/min. but be sure you check. Then as Lehua said tie zones together and get the flow more in line with the intentions of the pump. Not sure what area you are in but in some areas your well has a drop pipe in it....if you have this case you can discharge some water back down your well to compensate. Tie into a zone pipe and have a gate valve control how much water discharges down the well when the zone is on. If you have a body of water around you can also do this (lake or canal). I would not get rid of the tank or pressure control. What I would advise (most expensive solution) is to get a sprinkler pump without a tank or switch and run the system this way. But I would not get rid of a tank on a pump with a switch.

Good luck,
Tom