Will a hotter coil solve the problem? Probably not…
If cleaning or replacing plugs temporarily cures the misfire, the problem is not likely the coil. In fact installing a “high voltage” coil may even make it worse.
Suggest rather you look at the following:
Spark plugs’ heat range is too cold. Switch to plugs 1 – 2 heat ranges hotter than what the manual suggests. (Note: This is a common problem when you combine extended operation under light load - the “yard work” you mention - with the poor quality gasoline we’re stuck with today.)
Carburetor is set too rich. If you see any trace of black in the exhaust – especially at idle - it’s too rich!
If you use the choke to start the cold engine, get the choke opened and the engine under load as quick as possible. (Excessive choking on a cold engine fouls plugs VERY quickly…)
Make sure the engine’s thermostat is present and working. A cold engine lightly loaded tends to foul plugs.
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