Exactly Brian.
I ran several tests measuring down pressure, hydraulic pressure at ports, etc. The X585 has this problem while others like my 318 have very little down pressure. The X585 puts equal high pressure on both sides of the cylinder when in float. Because of that, one side of the cylinder has much more PSI because there is a larger surface on the piston that does not have the rod attached. The 318 appears to have equal pressure also, but it is not seeing the supply pressure I guess. At full throttle the X585 will take the squat out of the front tires when in float! With the engine off, I had about 102 lbs of weight resting on the floor. At full throttle in float I had about 220 lbs! Hope this all makes sense. I love my 585, but am very disappointed that Deere can't help me.
Joe