Turbo size should not matter for that. stock turbo or not, your car should start and idle on 440's because the emanage is changing injector pulse to compensate...Are you manually entering the correction factor? I just put before and after injector sizes and it calculates it for me....ended up being like 0.636 or something
But, everyone's car is different. If it works for you, i say good! Now add fuel in the add'l injection map till you're at least a safe 11.9ish or richer in boost, being a stock motor and all...i also wouldn't go more than 10-12psi....rods are very weak, i found out the hard way a few years ago