Sorry I didn't answer your question mate, but I don't know of anyone (I am sure they're out there somewhere) using a piggy computer of any sort on the 4AGTE, everyone I know know with them in Canberra (6 in total) are using various standalone ECU's.
It ran as good as a factory car with the standard ZE ecu and turbo set up. It got good mileage and made a nice amount of power for the street, so I feel that is a decent setup. It had no probs in any conditions.
Mine was and still is running a highflowed Garrett T28 runnning on 18.5psi.
Cheers.
I know a more of the nissan crowd get into the SAFC's so perhaps ask on a nissan site if you don't get any help on here.