To start with, you need to know how much water is being delivered to your area in question. The goal, in a sun-drenched area as you describe should be about 1 1/2" per week. Place several rain gauges (or in the alternative, tuna cans) in the area, and run your system for its programmed time. Check to see how much water is applied during the cycle, and multiply by the number of watering days each week. This will also show you if there are gaps in coverage. You can adjust run times to increase the amount of water applied.
If you are using the Hunter MP heads, those are designed to deliver a lower overall volume in order to conserve water. You could try the MP3000 360° head, and adjust the "throw," but if that still isn't sufficient you may need to change out the whole sprinkler body with a model designed for higher volume. Of course, you can always hire a pro to inspect and analyze your system, and make recommendations.
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