If the door's properly adjusted AND you have the correct profile weatherstrip, the weatherstrip shouldn't make the door close hard. There are a couple of possibilities. The door could need adjustment, you have the wrong profile weatherstrip or the weatherstrip is routed incorrectly (it can happen). If the door's gaps are even & straight and the door skin is in line with the fender & cab (not sucked in too tight) about all it can be is the wrong profile (too thick) or mispositioned weatherstrip.
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