I'm on holiday at the moment and don't have access to any tech info except the GEMS data. You've obviously got some data there as you have tried to check the data from the MAF which has come back very different.
Ideally, you need to phone around to see if anyone has an automotive oscilloscope like a PicoScope or something, that way the data can me monitored live and checked that way.
The ECU's can turn iffy. My GEMS one is only switching one bank half way, even though my HO2 sensors are working fine.