With the needle valve closed ,idle engine and slowly open needle valve watching turbo, as soon as the actuator arm begins to move[fall away]
nip up lock screw on needle valve. as per Chazs' directions. I seriously cannot fault mine ATM, in a nut shell its flying. I get 12.8 around town BTW.
Not bad for a 4x4 with 200k on it, it drives like a new one imo. I'm very happy
Not everyone has the needle valve fitted.
Which ever way you turn it do it in 1/2 turn sectors remembering which way you went.
From what youre saying I would screw needle valve in 1/2 turn like closing it off and see what happens.
You should restrict turbo spool up rate, IMO I cant see how it changes boost
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