I have a Mini Z 19/42 I just purchased the mulching kit. I didn't change the blade I have the Fusion blades. I notices alot of grass getting blown out of the front of the mower. I also had alote of clumping grass in yard. Is this expected the dealer told me that I don't have to replace the blade. I only have 3hrs on these blades. I don't want to spend extra money for new blades usless it will correct these problems. the cut was good . Other than that I love this machine!!