Question since i am a little familiar with your farm. 200 ft in elevation, straight up, is a high hill. Are you sure on that?
Distance usually effects pressure more than elevation in our area.
A couple things about a storage tank and gravity systems. Its easier on a pump to run for 20 minutes constantly than to kick on 40 times a day for 30 seconds or 80 times for 15 seconds.
It doesn't require a pressure tank. Pressure is added by elevation.
Even if power is out you can have water for several days.
I have 2 systems with 1800 gallon reservoir and love them. They pump on a timer and fill up daily. Water runs out to the tire troughs and ball waterers by gravity. On a couple i had to add a restriction to keep the pressure down.