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More likely to be a poorly seating float needle or a sinking float. Might be due to the rich carb touching the frame. You might find a bit of fibre between the needle and seat. If the plug was sooty due to oil, it'd probably smear and appear greasy when you wipe it with your finger. I'd be fitting #3 slides to both sides, and the recommended needles with the clip in the centre groove, and keep the jetting identical in both carbs. The recommended main jets should be OK. The only thing you usually have to play with are the needle heights unless someone has gone silly with a drill.