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For that large of an injector you would be at the maximum correction essentially.
550*.5 = 275, stock injector for the KA is 270, so it should still run and probably do ok, but as for anything but that you need a wideband and a dyno, although I would recommend getting a ROMtune of some sort.
As for MAF settings that is all in APEXi's setup guide on their website, so set maf type correctly, set Cylinder type correctly, and then just dial in -50 correction on low throttle and it should fire up...
I ran 480s on my KA back in the day with an S-AFC and it worked out OK because there were no other options for me really, and I ran low boost and had a wideband that I kept an eye on it with but now with so many different options available for KA stuff I would strongly recommend getting a good tuned ECU.
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