Well, did some testing today..

In 4th gear holding brakes and pushing trottle for a few secs.

Boost was like this.

2000 rpm : 2 psi
2500 rpm : 6 psi
3000 rpm : 14 psi
3500 rpm : 19 psi
4000 rpm : 17 psi
4500 rpm : 17 psi
5000 rpm : 17 psi

Doesn't look to bad i think.
But when i'm accelerating i've got boost @ say 3000 rpm on my boostgauge but nothing happens for a second or so and then it starts pulling.
Also i'm like 1000 rpm higher then so i thought the turbo wasn't making any boost from 3500 and on but the gauge tells me different.

Could this be solved by a good setup?