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So, a few questions.
Are you using auto gas cause that stuff seems to fowl plugs faster (black) than avgas.
Are the plugs black?
When you get back from a flight and your idling at say 800 RPM. Slowly pull the mixture while watching the RPM. If you got a 40 or so rise or more your probably rich at idle.
When you get back from a flight do you do a mag test?
Have you ever properly set the idle mixture screw?
After fighting this for a long time I consider myself an expert on MA3SPA carbs! LOL.
I just switched to Tempest UREM37BY plugs cause they are short and don't hit the cowl and they are supposed to fowl less. So far so good.
Plugs, have you cleaned them recently? Measure from the center electrode to where the plug wire hits the center. You should see less than 1000 ohms. On Champions they have a resistor block inside with a couple of springs that rust and make for a bad contact. Cracked ceramic? Old wires? Old mags?