Excellent theory!! My 21 did the same. I wonder if its blade speed. I do have some new grass out back that's softer and thinner that cuts really nicely from the cub. Ill keep trying different things. I keep the deck as high as it will allow. I'd love to put a larger tire on to raise it even more. 3.5 seems more like 3. I'd really like a true 3.5 or 4.
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