Have you ever flown your aircraft to a stall? You need to.....pull power off keep nose level and see how and at what speed it stalls...with altitude of course....one of the reasons for excessive speed on approach is fear of stalling.....another reason for too much speed is too much altitude on base leg and final....trade off for too much altitude is speed.......prop too small (not enough drag)......</p>

also throttle does not control your speed...altitude control is your throttle....speed is controlled by the elevator...try to descend at a nose level altitude......if the sink rate gets to be too much use your throttle to slow it down by adding a click or 2 of power and taking it off again......as you cross the threshold of the runway power all the way off if it wasn't already ....at a few inches slowly add elevator bring the nose up and slowing the airplane down until it settles onto the runway...</p>

Good flyin</p>