Have been using a zero turn for about a dozen years. We are basically flat land but my in laws yard has a slope down to a branch that can be wet with water seepage. Hard to use a zero turn on wet slope, the rear tires are pulling and being slowed or stop to steer, easy to bog. Check the owners manual for tire air pressure, you may find your have them at higher pressure than recommended and that will really affect the ride. Be careful on wet slopes around a ditch, easy for them to slide side ways. If it begins to slide sides ways into a ditch or such turn downhill as soon as you can. Much safer hitting it head on than sideways.
My 16 year old grandson cut our lawn today with our Ferris. He was grinning from ear to ear.