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I'd check that. Its the only thing which is different and could effect duty in the way it is. If your fuel pump or injectors were struggling to supply fuel at 1 bar, your knock figure would be higher. So something is forcing the duty up on the injectors. FPRs are a cheat anyway. Its better to use larger injectors which were designed to flow higher at a standard pressure than force smaller injectors to flow higher at a higher pressure. Try fitting the original and see what happens to the duty.