Injectors at their limit? Poorly mapped chip? Crappy head work?
Cams dont work with the head?

Alot of people think they can put any cam with any head and zorst and have it all add up and work together but it doesnt work like that.
If 2 components are designed to work together then you wont get what was intended.
For example if you see dyno gains of 5bhp from cams, 10bhp from the head and 4bhp fro mthe zorst seperately you wont necessarily get 19bhp when you put them on together.
Sorry dude.