Its hard to say just by looking at the plug how lean it is but most of the modern sportbikes run very high compression ratios and lean mixtures to make power. basically a balance between detonating and running clean. Using a higher octane is only going to safeguard the motor from detonation or extreme cylinder temps.
I would definitely check your A/F a motor can run on the verge of breakdown for a while before it shows its signs of wear and tear.
Just because it sounds good runs good feels good doesnt mean it s good.
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