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How many miles do you have on the kit before dynoing? It looks like the ECU has not fully adapted the WOT AF ratio and is still running in the default rich setting it comes with from us after reprogramming (for safety until it finalizes the adaptation process in the actual car). You should pick up substantial torque and power once the ECU adapts. If it does not adapt and AF ratio's do not go to mid 11's from 4500RPM and on, then you need to look into primary O2 sensor position or possibly replacing them.
Have you verified the AF ratio using another measuring device? It could be that the dyno AF sensor is off. Another AA car was dynoed on the same bench 24H earlier and also showed a very rich condition so this is very possible.
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