I have seen 2 different maps from Prodrive for the WRX from this era.
One has fuelling pretty well pegged at 11.2AFR on boost which is a good target, although the map is quite crudely set to 11.2AFR which is unlike any other (a lot of copy/paste going on).
The other Prodrive map can be anywhere between 10.2, 10.45 and 9.65 at full boost depending what cells in the map you are hitting.
That AFR trace you have posted would seem to indicate you are on the latter Prodrive map.
The power output provided can be adjusted by the operator. If the load is not calibrated correctly for the car (i.e they are not used to running Subaru's) then the figures can be well off.
I once went to a non-Subaru wise tuner and the first run was 355BHP for a car that was rated at 320BHP. A tweak of the rollers and it was at 326BHP.....simple as that.
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