My advice and technique:

Download the flight model mod and follow the read me.  Next, remember in general that you pitch for speed and adjust power for altitude.  On approach, this is especially true when maintaining glideslope and approach speeds.  What you are experiencing is an increase in induced drag, which is the second type of drag that is produced whenever an aircraft is producing lift.  Induced drag increases when speed decreases.  Try and use the power to maintain the glideslope and pitch the nose for your airspeed.  I also try to maintain 220 kts around 10-12 miles out and gradually slow to around 140 knots while extending slats, flaps, and gear, and I reach the wind compensated vref speed around 100 feet above the runway.