One of my 42in. decks really cuts terrible when I go side to side on hills. Does anyone have suggestions of what to check. I checked the level on the garage floor before I went to cut using a ruler measuring from the garage floor to the bottom of the deck. Are there some things that happen when the deck is at an angle that don't show up on a level surface. The hill is not so steep that I have any trouble going side to side. I would like to fix it before I start scalping lawns in about 3 weeks.