Let me try to clarify the relationship between high load and injector size so you can get what I'm talking about...
If your car was working well with stock injectors set to the factory 361cc setting then you know the ECU has the right scale. Installing 550 injectors "should" require setting the size to 550. You should be able to tell exactly what your injectors are flowing by the required injector size in your software assuming no other issues in the car.
Latency is irrelevant to that process. (let me explain why):
The latency setting is a compensation for the amount of time it takes for the injector to physically open. As you'll see in the stock table at operating voltage, that's approx. .45ms on a stock injector.
For discussion, let's assume that your car idles at a 2.0ms IPW, and on a high load pull reaches 20ms... If you make a -.2ms adjustment to your latency, you would subtract that number from your IPW to see the effect you made. In this example just made the idle IPW 1.8ms,(a relevent adjustment) and you made the high load IPW 19.98ms (a completely irrelevant change)
"IF" you are confident there is no other issue in the car causing a lean condition. I think you've already established that those injectors are not flowing as expected...
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