Andrew,
Not sure if I am correct in saying about your EGT reading is due to a combination of water and rich air/fuel mixture.
Rich mixture tends to slow down burn speed more than water. A retarded burnt will produce high EGT. Water will take some heat away but will also slowdown the burnt further so the cooling effect could cancel each other out.
Try leaning your fuel first and injecting water and see what the effect is.
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Richard L
aquamist technical support
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