I have a used Scag 36" walk behind. I'm just starting out in the buisness as well. I can cut one yard with it, and it looks great. I can use it on the next, and it leaves some pretty nasty footprints, as well as pushing over large blades of grass, rather than cutting them. The blades are brand new, and the mower was just tuned up. Any tips, or cutting techniques anyone can suggest? Many thanks.