First of all unless you set rain gauges out to measure how much water you're putting on there is no way to tell if your'e getting too much or too little. I put .25" to .35" on every other day at 100% seasonal adjustment. You need find someone who is proactive, preventive, with insects, weeds, and disease. All 15 lawns I take care of get fungicide, insecticide, and pre emerge herbicide twice a year, March and again in June.
I've also found that Zoysia likes to be mowed at 3" and bagged, not mulched. Less than that burns it taller than that and you get a very bad thatch problem.
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