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The fact that the ECU is subtracting so much fuel trying to get to stoich makes me wonder if fuel pressure is too high or a fuel injector is stuck open. Given the fact that you have aftermarket (probably larger flow rate) injectors, then you probably need to tune the duty cycle with either a remapped or stand-alone ECU or piggyback to get back to stoich. That big a corrrection makes me worry that the ECU may change the overall injector size scalars and make the car go lean open loop, so I'd treat this as more than a nuisance.
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