My engine has group a gasket and other bits, i have bought a stage 3 kit off someone on RSOC.

Consists of T34, Rs500 Cooler, Stage 3 Chip, set of Greens, 3 bar map sensor.
The T34 has a -34 and has had the preload set by turbo technics

The car only boosts to 17psi, how do i increase to 22, i can wind out the actuator and it increases but i thought you shouldnt overload it

Someone suggested rejetting amal, is this correct, if not what do i do