If this scenario is what bothers you, it's the nature of that beast...
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A 2 strokes motor will foul spark plugs from brand new out of the box if the motor runs at idle rpm for long time trolling periods, will depend entirely on the motor's brand, the fuel/air idle adjustment, 2 stroke oil type, mineral, semi synthetic, full synthetic, if the motor runs a 50:1 pre mixed or it's a VOR motor which uses very little oil when the motor runs at idle compared to a constant pre mixed 50:1 ratio burned at same trolling idle rpm,
So if the motor hesitates a bit when opening the throttle after trolling for long time periods, when that small hesitation ends run that motor wot as if stealing the combo when returning to terra firme for the spark plugs to be self cleaned. Use the spark plugs and heat range the manufacturer recommends...
Happy Boating