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Are you sure it's detonation at 18:1? If it's a popping sound, that's probably misfiring not detonation. Detonation above 16:1 is very unlikely because you have a lower flame temperature.
I've written about my experiences doing this on my Scion FR-S (a Subie FA20 motor). It doesn't like idling at 17:1 no matter what, and doesn't let you tweak cam timing at idle to reduce EGR. Lean burn only works when the engine is able to consistently burn the mix quickly.
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