My comments are in Grandstand thread review on things you might change in how you operate the machine. Short suggestion, always turn uphill and back down to the next pass when starting a pass next to a completed one. See other suggestions in grandstand review thread. I have a 52 and can hold any hill on it that can be held with a zero-turn mower of any type as long as the turf is in good shape and the grass is dry. Tires are at 8-10 PSI depending on the day and I weigh about 150 and I shift my weight to the uphill side of the machine.Yes the steeper I go the slower I go but I don't have any problems tearing up turf if I turn the right way and go across the slope at various angles instead of straight up and down.
Hope this helps!