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VP is a good brand, you might want a slightly lower nitro content for that engine, most turbo-plugged engines have relatively high compression designed to get the most power out of 16-20% nitro fuel. Alternatively, if you have a larger head shim, swapping that in or adding one to the shim stack...

Normally that coil deformation would suggest you're running too hot & lean, but if you're staying under 200F that doesn't seem likely. That leaves detonation... The low speed needle might benefit from being leaned out a little, and the high speed richened. What fuel are you running? You may...