I agree that you are watering too much. An inch to maybe an 1.5 inches per week is sufficient. I do question the comment that you should water only once per week. The water needs time to absorb into the soil and I would think that applying that much water at once would create pooling and draining issues, but would like to hear the reasoning for once a week.
Scag Tiger Cat 48-inch deck, Kawasaki motor
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Stihl BR550 backpack blower
Stihl KM110R kombi system with lots of attachments
Stihl HS45 hedge trimmer 24-inch blades
Echo SRM210 trimmer