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Did you pull the plugs after a run, or did it idle first? Idle time on the plugs before reading them can cause them to read richer than it is at WOT. Shut the engine off immediately after a hard run and pull the plugs to get an accurate read.
Another way to verify mixture is by looking at the piston wash; look for about a thumbnail's worth of carbon to be washed off of the piston next to the transfer ports. More wash leans rich, less is lean.
Another way to verify mixture is by looking at the piston wash; look for about a thumbnail's worth of carbon to be washed off of the piston next to the transfer ports. More wash leans rich, less is lean.
