For tuning with the NN on it seems leaving the stoich value stock works just fine. I agree in "theory" it should be changed but it doesn't seem necessary.
I mean Dodge didn't even use the correct stoich value for pump gas. Why didn't they? Who the hell knows, but it works. Dodge does some crazy stuff.
FA stoich for 100% is .0680. If you change the stoich, IMO you will have to change every FA table in the tune to compensate for the difference.
Not to mention that the factory air model and fueling is way off from the factory. What the ANN "fixes" is amazing. It's "hacked" from the factory. That's one of the reasons when you try to tune it "the right way with VE" things are so complicated. If ANN did not do so much virtual calculations IMO when you turn it off it wouldn't be so far out of whack. I think it's similar to the way GM does their virtual VE that is MAF based(even though I do not have any first hand tuning those)
The more tables, PIDS, switches, etc, takes more RAM and more processors which equals a more expensive PCM. Having a "virtual network" greatly reduces that. On the flip side of that look at the new Copperhead PCM's. The 15's have like 50+ spark tables? Not to mention all the VCT stuff and torque tables. Dodge PCM's don't have that.
Sorry I got side tracked. My point is Lambda.