I've been told my loss of power is due to heatsoak and over boosting, but i'm running a k03s. So i've bought a larger intercooler, getting a low temp thermastat too. Hope that helps it.
My car was spooling up fast but dropping off to soon, giving less peak figues. So we adjusted the actuator, to
help it hold boost for longer. In turn, hopefully giving it a larger peak figure of what i paid £500 for, (stage 2 revo)