i am a big supporter on this site about kubota and have used the zd series since its conception and the original old style deck before4 the pro deck with a zd 21. then have upgraded as the design got better as i really loved the diesel performance and power. i currently use brand new 326 models with 60 inch cut which replaced our zd28 60". i have found that they do not get the hillside traction that the zd28 was superb at. i have come to the conclusion that it is due to increased height and weight of the new machines. i love the new power behind the new transmissions and the overall better comfort of the machines and way better cut, but the old zd's really held hills better than all the other brands except maybe scag, they do really well. My question is are any of you familiar with this and what have you done or tried to do better on steep inclines with the 300 series mowers.