Tuning from EGT does not work that well once you are injecting water, or alcohol, and are taking advantage of the more agressive ignition advance injection allows because of the higher knock threshold. As ignition is advanced, EGTs will always decrease (without any other tuning changes), because the cylinder combustion process simply has more time to be more complete before the exhaust valve opens. EGT is better used as a reference point for A/F changes, and as a safety monitoring input after everything is tuned.
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