best tip I can give is know your airspeed and hold it as exact as physically possible. It is amazing what a few knots will do to float. Also try picking an aiming point well before your touchdown point and keep adjusting to keep yourself aiming at that point. Once you pull power keep the airplane coming down in the same pitch attitude until you are a few feet above the runway and then hold it there with back pressure that should also help minimize the float.
and stabilized approach...be able to fly the entire approach on glidepath and on airspeed with very minimal control movements and without touching the power.