Another starting point would also be the fuel maps being employed.
Using the IDC of the injectors vs RPM & MAP for the initial duty cycle of the high speed valve with jets sized to a % of the injectors' potential would start you at approximately the same point as the 2d. From here the WI map could be modified based on torque and knock feed back as fuel and timing are adjusted to the targets. Of course from this standard starting point fuel and timing need to be adjusted to make use of the starting injection map.
If the fuel and timing in an area of the map are at desired levels but torque has fallen off from prior results, reduce the water injection rate at that point assuming knock isn't being encountered, which it shouldn't be.
If knock is being encountered prior to the fuel and timing desired for an area of the map, increase the water injection rate further at that point to permit tuning to the desired lambda and timing advance.
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