When I put my foot down, my car boosts up like normal then when I let off to change gear it makes a funny squeek noise like a shoe on marble floor if you drag your feet??

It squeeks for less than a second but its quite loud. Could this be the hoses??

They are standard hoses running 15psi and feel a bit soft but would this cause a squeek if they are fucked??

Also its losing boost in the higher rev range when its got a new -31 actuator on going to as low as 11psi sometimes??

Sound like fucked turbo, hoses or something else??

Any help appreciated thanks