Tune the low maps so the ECU isn't working too hard to get the proper AFR. Also, you need to tune the low and mid maps to get somewhere close to 14.7:1 as the ECU isn't always in closed loop in those ranges. You can't stray much from what the ECU wants the AFR to be at in the low and mid maps but yes, you need to tune them all. For the high loads (about 70% throttle or more) you can tune for whatever AFR you like. My preference is to tune the mechanical hardware to get as close as possible across the whole spectrum and then us the fuel controller to fine tune everything. Try unplugging the stock O2 sensor feed to the ECU (forcing the ECU into full time open loop mode), tune after a cold start, aim for 13.5ish for the low map and 14.5ish for the mids, reconnect the O2 sensor.
Do NOT try to clean the AFM. You can blow the honeycomb out with some compressed air but NO cleaning solutions or solvents. The sensor is optical and if the cleaner enters the sensor or fogs the lens the entire thing may be ruined or way out of whack.
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