Problem is, most people cannot apply less than 1 lb of N because fertilizers are normally formulated for cool season grasses. Cutting the N rate means the lawn risks looking like a green Dalmatian. I would also have a very hard time if a bureaucrat said my application of 1-2 lb 21-0-0 is out of compliance with the fertilizer law. The older cultivars of zoysia are just ugly. Straw colored unless overfertilized and a thatch monster unless the lawn is kept very dry. In normal years, I have total control over the water from May to December. Zoysia is kept at 1" of water per week or less. If a lawn cannot be maintained on a 7 day mowing it is overstimulated. I understand in your area, it rains in the summer months. I do not have that. In Hawaii, it can rain during the short day, cool temperature months, so a lawn can be rough to keep between December and May.