I believe that's the goal when it comes to tuning, yes. In stock form, these cars run a bit rich (conservative) and compensate for airflow changes by monitoring A/F ratio in real time and adjust on the fly, within their allowable range. This is how the LAP3 Uncle Chip gets away with turning up the boost without having to control fuel also. It only turns it up enough to add some gain, without requiring the car to go outside of its pre-programmed limits for fuel adjustment due to WBO2 feedback.
Yes, AFR was logged stock, as well as with each level in the Lap3 Uncle Chip. See the graphs below. HP on top, boost level in the middle and AFR on the bottom. 4 runs graphed. Orange is stock, green is with 89 octane setting, blue is with 91 octane setting and red is with 93 octane setting.
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We only get 91 octane here in Vegas due to our elevation above sea level and the lower density altitude pressure here. In most cases, that means we can get away with the same tuning here at 2000'ASL with 91 octane fuel as someone at sea level would with 93 octane fuel. With the 93 octane setting, the box caused my car to knock at the very top of 1st, 2nd and 3rd, and right when the shift occurred into the next gear. That last 10hp wasn't worth the risk for me, so I went back to the 91 octane setting and it works great.