I'm looking to possibly buy one of these units with approximately 1,300 hours on it and it has the advantage deck. When I tested it on asphalt yesterday the hydros felt really sensitive and jerky. No matter how slowly I tried to move the sticks the machine would either accelerate really quickly lifting the wheels off the ground if I was too quick or locking up the wheels coming to a stop. Is this a sign of worn out hydro pumps or something else? The machine also tracked unevenly...this I believe can be adjusted to correct using the threaded linkage right? What is everyone's overall opinion on these units? Is the 27hp L/C Kawasaki engine strong enough for this machine? I mow 3-5 acre estates so I need a reliable large deck unit. My Exmark Lazer Z 60" with a 35hp B&S VanGuard kept going through mule belts last season so I'm thinking about giving the Turf Tiger a try due to the shaft drive to the deck.