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10.9 is not too rich on a rotary. If you are pushing 15psi on pump with a turbo that big, I would keep the car below 11 anyways.
Are you on the stock ignition system? Its probably tired out and can't keep up. Most people run the HKS Twin-Power when you get above 350rwhp.
If the plugs aren't all fouled up, it shouldnt make that much of a difference concering the breakup. Running underrated plugs will just cause pre-ignition.
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