serviced my s2 today after she sailed the mot runs spot on drives fine quiet as a mouse took it 4 a spin and sometimes it will only boost 2 psi or so.new race tech gauge. i havent had her set up since 2005 but have not tamrered with[timing boost presure]im assuming i need an actuator as it feels as as if the waste gate isnt opening

standard car(unchipped}

im thinking the easiest option is to get a chip actuator and set up?
engine advantages is on my doorstep field motorsport is a stones throw as is rallytech and shepardsmotors
last setup the car made 130bhp 164.5 torque all origional{turbo.cam.pistons the lot}117kmiles.what power would you estimate i would make at 1 bar im thinking 150 to 160 bhp
thanks in advance fellas