I have a 48" stander with a 19 kawi on it. It seems to be pushing the grass down as opposed to lifting and cutting. I have a set of recently sharpened mid lift blades. The blades are pitched forward 1/4" with the front cutting at 2-7/8" The rear wheels are set in the middle and the front casters have one 1/2" spacer on top with 2 on the bottom. The blades have one 1/4" spacer on top with five on the bottom. The belts are new and tight and I did check them for tightness after a few hours of wear. The spindles seem fine with no play in them. The blades are on correctly. The bottom of the deck is clean. The only thing I don't know is the rpm's. What should it be with the blades on/cutting. I am going to get something to measure the rpms but wondering if there may be something esle causeing this? Am I cutting to high? It cuts like this with varying degrees of uncut lawn on all my lawns with different types of grass. Thanks in advance for the help!