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Without seeing the design, gravity may be assisting your motion in one direction and resisting motion in the other direction. Your load may also be more than this plate if it is pushing product in one direction but not the other. If your actuator is a single rod end then the different area’s (or volumes) in each direction could also cause different stroke times. A pressure regulator or flow control (typically choking the exhaust side) could be used to ‘slow’ down the offending motion.