The OEM ECU is in open loop during start and for the first few min. after start, it will be ignoring the O2 sensors during this time and following the base fuel table. The base fuel table will be modified by the OEM ECU for ECT and IAT untill the O2 sensors have completed the preheat cycle and then the ECU will start to trim fuels. This could be 1 min or could be 5 min depeding on ECT.
The other issue we have is the batch fire issue, that is why the FIC uses a special firmware when used with the NSX. This may be a question for the AEM guys but there may be a limit to the fuel injector drivers in the FIC while in this batch fire mode.
Either way I still think there is a mechanical or electrical issue in BobK's case.
Dave