Control Valve with volume booster

I have a following issue with my pneumatic actuator assembly

The actuator has a volume booster. i’m trying to adjust booster’s bypass screw.

Every time i screw it IN too much, actuator start “hunting”

Can you, please, explain, how much this screw should be in/out and what actually cause the hunting?

Thank you!

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Check the required pressure (it may be dropping) for the actuator during adjustment of the bypass screw of volume booster.

Share your volume booster and actuator mode and make details, & its existing setup diagram.