I think the injectors shouldn't matter - it's the injection pump that decides how much fuel to send, the injectors just 'pop' at the right pressure and let the fuel spray into the prechamber. Drive the car hard for a while, the smoke should gradually lessen. If I drive my car easy for several hundred miles, then floor it through a couple of gears, it will lay an impressive smokescreen. However if I repeat that redline run a second or third time, the smoke will be almost nonexistent. Idling, light loads, etc leave a lot of carbon to be burned off...