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Putting extra oil in the tank actually leans out the mixture as the oil displaces some of the fuel. Therefore less fuel gets mixed with more air, which = leaner.
Also for a proper plug read you should run at full throttle for a while and kill the engine while still holding full throttle. When it stops, swap in another plug and take the other one home to inspect.
You could've been very rich at idle and lean at full throttle. The lean at full throttle is what kills an engine.
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2005 Yamaha BWS (Zuma) "Garfield"
TP Black Trophy 70cc, Giannelli Reverse Pipe, 5g Dr. Pulley Sliders, Delta Clutch with Yellow Springs and Yellow Contra, Malossi Torque Controller, Naraku R-Vent Bell, NCY Adjustable Secondary Sliding Sheave, CF Reeds, Kege Analog Tach, Dual Headlight Mod, N.A. Rear Fender Delete, OEM Short Windshield.
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