With the rain I noticed a bit of scalp/lining on hills too. Our z200 is 10yrs and 2300hrs has about 1.5" side to side. No front to back. The 2010 z500 just got 500 hrs service has about an inch side to side. No front to back. The decks both move side to side but they don't rock or teeter on there mounts. Like the idea about tire pressure, I run em lower for handling and traction.