Boost Failue

[Turbo Zo1]

I just got my new combination together adn the car is awsome. When I first started out driving the car it made plenty of power and boosted to around 25 - 27 lbs. of boost. I run that much boost because that was the sweet spot for my turbo which is a PT61. Just the other day when I drove the car again it won't boost over 15 lbs. When it reaches 15lbs the car acts like it is running out of gas and surges but anything under 15lbs the car pulls extremly strong. Any help would be very appreciated.

 

[ES1]

Might check and make sure the hoses are tight and there is no leak in the IC.