You are spot on, you cant just turn up the boost and expect power, you need to modify the car, exhaust, cooler, maybe fresh coil pack before even considering turning up the boost BUT, i can assure you that OP problem is not ECU as i used this ecu previously. Its something else, the problem was there even before Mines ecu, and my suggestion is to get good flowing exhaust, good cooler, coil pack and turbo tech manual boost T. And than run 12psi. Thats how i made 208 kw, and you should too providing rest of your car is in good nic.