As I said, hks tells tells the ecu it's running less boost even on tick over so you up the fuel preassure to compensate, which will make it an even fuel distribution, greedy jam or any clamp type Fcd will only tell the ecu the boost is less than it is at 0.8bar+ , so If you up the fuel pressure to compensate, below 0.8bar it will be running rich not sure if any of you know what boar wash is but what it means is that excessive fuel will basically wash the oil away from the boar and rings causing excessive ring wear and premature engine wear/failure