I’m sure when the system was put in all the heads worked properly. If the system was sized wrong it wouldn’t have worked from the initial install.
A couple things: clean all the filters in that zone. If you still have a pressure issue, dig down at each head to see if either the head is screwed on completely or if you have a leak at the head at the joint. If all of that checks out, cap all heads except the last 1, screw on a flexible extender and fill a 5 gallon bucket to see how long it takes to fill a gallon of water. You should be getting < 25 gpm. If not, you have either a leak or restriction.
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