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Depending upon where you want to adjust AFR, ECU will fight you using O2-sensor feedback. O2-sensor can only register 14.7:1 and ECU will use that as target regardless of what you put in. That's closed-loop mode using O2-sensor feedback.
Above 80% throttle and RPMs, then O2-sensor is ignored and ECU uses only pre-programmed map values only. This is open-loop mode. THESE are the adjustments that you can change and see it take effect.
So if you want to change AFR in closed-loop operating zones, ECU's gonna override you. Won't see any changes as it's gonna target 14.7:1. So you'll need to disable O2-sensor for your changes to take effect.
I suspect all you really need to do is tweak accleration-enrichment to get effects you want. Clean up some of hesitation when you crack open throttle.
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