Its suprisingly not that laggy, im spooling high 2,000rpms and on full boost by 3,300-3,500... What do you mean by "proper boost control" i tried the FRST AMAL valve and it was the same scenario except i couldnt get it to hold 0.5bar, it would tail almost off to nothing. If i half throttle the car and build boost slowly i can hold the boost at 0.8bar by backing off and re-applying throttle. But if i keep a contstant throttle, ie full throttle it back right off...

I don't think its a spike so much, ive been in cars that boost spike and usually they peak and hold in a 500rpm window max, whereas i have more like a 1,000-1,500rpm window!