Your EGT probe could be in a better spot, you really want your EGT probe to be in a spot where the exhaust flow from all cylinders flow past. Your airflow seems to have a lot of tight turns after the water injection point. I wonder if your getting any of the water mist to that cylinder that your EGT probe is monitoring. With the drop in IATs you should be seeing a drop in EGTs regardless. If its not to much of a hassle try moving the EGT probe to that capped port on your exhaust manifold and see what the numbers are.
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