checking the details
Sounds like you've already eliminated the possibility that you have a plugged spray nozzle, or something similar.
Do you have a means to log the car and determine where in the rpm range, and at what boost level, the car is seeing the detonation?
You might try lowering the turn on point a bit, if the spray is starting just a bit late for current conditions that would be one possibility.
Have you tried changing the water methanol mix, more water, or more alcohol to see if that makes a difference, you might try bumping your methanol to 70% and see how that works.
I don't recall off hand what your car configuration is, so a little more info on the engine, and setup would maybe ring a bell with someone.
Have you noticed any changes in engine temperature since the gasket replacement, -- could the engine be running hotter ?? ie thermostat, radiator fans not running etc. etc.
Larry
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