Another issue you might want to investigate is water mist distribution.
Do you know which cylinders are most prone to det? If it's always the same one, then perhaps all the water goes to the other ones.
Remember that water is much heavier than air, so it doesn't follow tight bends very well (more inertia).
So without a direct port injection your cyl1 might be getting totally different water quantities than cyl4 :wink:
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