I guess you have your turbo back from being repaired
The amount of preload you need on the actuator varies from turbo to turbo,
As a benchmark I would only set the preload at 1mm

To do this adjust the rod end so that it will slide on the waste gate only just holding it closed, then lift it off and screw in about e full turns down the thread, this should give you about 1mm preload, difficult to say how much boost this will give you, but it is a good starting point

Cheers

Steve