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Spark plug reading

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Hello, everyone, I have just finished tuning an RB25de+T under WOT full load the AFRs sit around lambda 0.75 on 95 pump gas at about 0.9bar boost the timing i around 19 degrees I dont hear any detonation through my knock detection so I figured everything was fine so I pulled a plug to inspect it and the ground strap seems to be way to white for my liking. Reading plugs is a mystery to me does anyone have any insight?

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Hello that is not an issue at all

the mixture actually looks rich and the strap normally like this

generally from peak torque the ignition needs to be increased gradually to the red line.

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