Hello, I've been cutting grass now for about 7 years. I have around 20 lawns and growing. I just purchased a Gravely 260Z this spring and just don't have enough good things to say about. The only thing I have a question about is the rear deck wheels. Its a X-Factor deck and when im cutting the two rear deck wheels in middle are leaving marks. They're leaving two lines right down the middle of the grass where I just cut. They cannot be lowered down or raised higher higher, they're fixed to the deck. I was just wondering if I should try adjusting the pitch of the deck or try just taking them off. Any advice will help. Thanks!