Full boost
U running rich only on fullboost? If the MAF hit its limit then you would run lean, not so?
More likely at full boost your plugs arn't igniting the compressed mix properly.
I'd say go for iridium plugs to increase your voltage per discharge area. You could also sharpen you platinmus and gap em down a bit to see.....but that wo't last very long b4 they get blunt again.
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