The problem with the Shafi'i position on swallowing phlegm and mucus when fasting

I have trouble following the Shafi'i madhab concerning what invalidates fasting. According to the madhab one must try to expel mucus and phlegm everytime one feels them in the throat; but only when it's possible. Which means you have to constantly try to get mucus and phlegm out because, like saliva, the build up of phlegm and mucus is a constant mechanism. One won't know whether it's possible or not possible without trying. If one doesn't try then it would risk invalidating the fast. Only when it's not possible will one is excused. I find this undue hardship and it makes fasting an impossibility. I need help because I've been in a state of despair for so long especially considering how many years of Ramadhan were potentially invalidated.