engine size is irelevent, its a zetec so all zetec rules apply beit 1800, 2000, or 2100cc. The spec you list is all over the place, wrong management, wrong injectors, wrong turbo, it sounds like a bit of a bitza. What gearbox and clutch are you running? that is the most important thing before cosidering more power, also what fuel pump does it have?
A management change and bigger injectors are definatly on the cards as i would say you will not be making any more than 150bhp on those injectors