Bob has just changed my one for a Forge actuator. The standard one wasn't man enough to operate the waste gate at 1.3 bar. I got the spring kit as well, I think we put the blue spring in there as the pressures are not quite what forge quoted them at.
The car was put back on the dyno just to check fueling etc and then the boost controller was adjusted to the desired boost level as it performed different with the new actuator. I would recommend you get Bob or someone to check the fueling etc afterwards just so its boosting / fueling as it should.