How it's affect inyector scaling

Hello! How affect inyector scaling on my oem ecu JDM Subaru Original set 560 CC Inyector but now swap to e85 and id 1000cc base pressure 50 psi inyector but Car running good on 660 inyector scaling? Who affect inyector scaling ? Duty cycle high?

In general with a non flex fuel capable ECU like the stock JDM ECU you'll need to trick the ECU into thinking the injectors are smaller than they are. I'd start with a scaling around 35% smaller than the actual injector size which is about on par with what you have now. Once you're in the ball park you'd scale your injector size and latency in the same way you'd do it for pump gas.