iv not tried one but i know what an actuator is and how it works, im no expert, just enthusiastic about my car
dont take offense to this but perhaps it was in your head...or maybe your old one was shagged and weak
you say it was made for 7psi....where'd you get that info from? just cos the
ibiza runs 7psi...doesnt mean the turbo unit was designed with that intended.
unless the original actuator is fecked, i wouldnt expect to see much gain if any...other than in your head telling yourself it was a worthy purchase