Actuator is new mate (Collins -31).
If it was that, the operator (whose name i have forgotten) would have recommended i get a new actuator not a new better Turbo!
He said that a standard t3 cannot supply enough air flow over about 4000rpm to hold that sort of boost, if i had a electronic boost controller i could bleed more off before the actuator forcing it to hold 17psi but the turbo would last about 2 mins and i'd have stupidly high ACT's!
So recommended a Stage 2 T3 for the job!