Yeah, when first got my car I got bored of the stock power very quickly, leaving me with the same questions as you. If it was really meant to be like that, or if my car had some problem.
Turned out to be coming on boost rather late compared to a friend's GTR. After a thorough inspection, it turned out that the turbo fins were kinda chipped and worn, but still functional.
A change of turbos, ecu, ebc, etc. and with a much lighter wallet, I got a 135rwkw gain at the time, without any extra lag
When it was stock it was dynoed at 165rwkw
Needless to say, I was stoked with 300rwkw, too bad that feeling of contentment didnt last long, or else I would be a much richer person now