When a new station is real
A new bed, a new wing of the house, or drip that was illegally tied to a spray valve can justify another station. The controller needs a free terminal, the supply needs enough gallons per minute, and the work is installation under the irrigator license, not a head swap.
When it is not
Adding heads to a zone that is already weak makes the old heads worse. Call 346-642-6161 and describe the dry area. We will say whether it is aim, pressure, or a new station.