If you know where your "buried" junction boxes are, you can open them up and see if there is any additional room in them. You would need to run underground piping from existing junction boxes (or newly installed ones) to the points where you want to break up your large zone. This also will require that you have some idea of how the underground piping is routed from head to head.
Twenty-five heads to a single zone is a very poor design. Our 9 zone system has no more than eight mister heads or four rotating heads per zone.
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This will probably require an expert.
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I agree.