Hitachi EX200 left track lagging

Hitachi EX200
Left track is lagging. When I actuate both tracks, the left track moves with little power.
I rebuilt the center joint/rotary manifold and have some improvement from before. Initially the track had almost no movement and now it moves, but still lagging.
The odd thing is that when I actuate any other control, I get full power out of the left track. I just crack any other control and full power.
I am at a loss.
All hydraulics seem to be slow moving. Swing is quite slow,...

Hitachi EX200 left track lagging

Hitachi EX200 left track lagging