I've been here six or seven years now and almost lost my lawn to thatch. To much water, to much fert. and not smart enough to listen to the extension service. I've used both power rake's and even went to the point of renting a thatching machine from Home Depot. Long story short the older your Zoysia gets the more it needs thatching. Thatch is not mulch but I think bagging at least part of your clippings helps.
I do have a power rake blade for my lawn mower if I can help or you'd like to try it I'd bring my lawnmower over and we'd try it.
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