I just put a double blade kit on my 36wb. gator blade on top regular on bottom. when I mowed it left very distinct stripes, but the light colored stripes look like the tips of the grass are torn bad. it looks as if it scalped the grass. I can not figure out how one pass can look fine the grass green and cut fresh . and the other pass looks ragged and dull cut. has anyone experienced this before when using double blades.