Just on this, amuse dont recommend that there ECU's are used over here... something to do with the fuel maps that are in their ECU's... It may have come off an import car....
With regards to the engine swap, did they do an ECU replacement?
It is low considering what you have but then the stock ECU can also overpower an add on over time if its not fitted right...
Where you based? I would recommed taking it too another turner with a dyno like Gary @ GTart and see what they come up with..
Get the dyno up and lets see...