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how are you guys getting your AFR? dual widebands or stocks sensors? Can you do a log of both AFR sensors over RPM in, say, a 3rd gear pull?
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Seems our 370zs have two WideBand O2 sensors. I just have to confirm what they are, but logging options show bank 1 and bank 2, WB A/F ratio. The ECU as well has a pretty nice AFR target map for the mixture to reach, and then there is a closed loop correction % for hitting that target taken from the main fuel maps. The sensors can absolutely be logged along with up to ~20 out of ~50 other sensors.
What you mean by half-mafing is adjusting the precision of the MAF to where the ECU will start hitting values to the leftern parts of the maps rather than values all the way to the right.
So in the Subaru world... Your MAF sensor<s> can go up to 300 g/s? I presume that is pretty close to the 5v mark and about ~300-325 WHP on an AWD turbo car. That about right? Im not educated on Subaru, but I'm sure you've got a different MAF sensor and as we've got two in our 370s.