I have a two spool hydraulic control on the Wagner front end loader on my Ferguson TO-35. The control lever to operate the main hydraulic cylinders to raise the loader works fine. ( Power up, gravity down) . But the second lever, which operates the small cylinder to adjust the angle of the bucket, is stiff, and doesn't find the center position by itself. From your work on your valve, what do you think might be the problem ?
Thanks !