Bray

I have a control valve (Bray valve with a Siemens controller, pneumatic) that is being used for level control of a tank. The level needs to be controlled within an inch of the setpoint. In the images attached, red is the command given to the valve, blue is the feedback from the valve (it has a feedback card). Clearly visible how the valve response to the command overshoots, the control is not precise enough. Leads to multiple level changes, which creates instability in the downstream process. We have physically inspected the valve, manually opened/closed the valve from the PLC to observe its movements, checked the air pressure to the valve etc. Everything checks out good, nothing wrong with any component of the valve. Could it just be the valve body? Its a 90 degree V-Port ball valve. Any help/suggestions would be highly appreciated Edit: Link to positioner:[Siemens SIPART PS2](https://cache.industry.siemens.com/dl/files/419/109782419/att_1034214/v1/A5E00074631-AFen_PS2HART_OI_en-US.pdf) Link to valve: [Bray V-Port ball valve](https://www.bray.com/docs/default-source/brochures/product-brochures/f-2600_en_vc.pdf)