"You can feel it when it arrives and leaves the floor".
Sort of a slight racking due to tight packing on one side. Well, short of a repack, which if you can feel it, your customers can too, you might try adding some Caterpillar Hydraulic Oil additive to the tank. Some guys will also spill or brush some on the heads too, but I don't know if that's all too effective. There are times when this does help. Also, be sure your jack resync time is sufficient.