try this cosrush and you will see what i mean..if you have standard actuator...disconnect actuator pipe completely.....set actuator with no preload ie...rod goes over wastegate with about 1mm pull...run car and record boost pressure....now shorten actuator to 1/4 of a hole preload...run car and record boost again...boost will have increased because of the preload.........there is no pipe connected to open actuator and bleed boost ...it is pressure in exhaust side of turbo forcing wastegate open and releasing it.....so before you start playing with amal valve you need to make sure actuator can hold the maximum boost you require....give it a go,and when your actuator is set to your max boost,reconnect amal pipe and run...the boost will now drop amal valve will open actuator too early...this is when you experiment with different size holes(smaller to get your required setting)