let's start with the basics. You may have too much pitch on the prop or too high an idle. The way I teach you should be losing speed even before entering the downwind leg of the pattern and smoothly and steadily dropping speed from then on (depending on wind conditions). By the time you turn on final approach you should be down to just above landing speed (allowing for gusts) and fly a fairly constant stabilized approach from there just like a full scale does. Set your glide path and use the elevator to control speed and the engine to control altitude. It's a balancing act, part of what your training is all about. Let the plane fly down the glideslope with the nose either level or just slightly (1/2 wheel) high.

Prop & low smoothe idle are first. Also double check your CG.