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The small amount of water discharge you are seeing is normal in these RDs with thermostats. They just put out some spray when the thermostat opens.
J4C is the correct plug for it. Before you go to hotter plugs, try a bit leaner setting on the idle mixture screw as long as it runs OK. If you continue to have problems, I’d make sure the low speed gas passages from the carb bowl up through the needle valve and into the top of the carb throat are clean and clear. Spray carb cleaner through them all. Be sure the float level is correct. If you are going to idle like that a lot offor hours at a time, then, the J6C may be the way to go, but the J6C can self-destruct at sustained high speeds.
I’d leave the motor alone unless it happens again – you could have just had something in the gas that had to work through the carb.
Dave