Luke,
It may be worth running a bit leaner while W.I. is operational - tweek it a bit an see if it makes a difference.
But first make sure that the water mist is equally distributed among the cylinders under pressure. Otherwise you risk a couple of cylinders getting all the water and the rest running 'dry'.
Also how good is your intercooling? Is there a good flow path for the air to go through the intercooler core in the Corsa engine bay?
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