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Rich mixture does not cause detonation (pre-ignition). A lean mixture will super heat parts of the piston top that will act as a spark plug totally out of time with your ignition wishes. Octane booster won't hurt but probably won't help either.
First thing is to make sure mixture is correct. Do you have CIS or carbs?
Where is the timing set now? Should be somewhere in the 26 degree advanced range all in.
Like has been said before, detonation is sometimes very hard to make out. It might be that what you're hearing is something all together different.
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Tell it like it is or don't tell it at all.
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