A couple of things you could try:
1. Roll out of the final turn, then lower full flap and trim to the approach speed. DON'T be tempted to add anything extra!
2. THEN aim at a reference point on the runway touchdown zone and just KEEP the reference point FIXED in the windscreen; check the IAS and adjust it with small, precise changes of power alone to correct any errors. This is called the 'point-and-power' technique.
3. As the world starts to come up around you at the flare, look at the far end of the runway, close the throttle FULLY and just squeeze the rudder to align the aircraft with the runway immediately before touchdown.
Hope that this will help you!!