One of the reasons for keeping 160kts to 4DME is to try to reduce the noise footprint over heavily populated areas (as well as getting most efficient runway usage).
You will give yourself problems if you use the technique as described above....
What i do is
180kt ( CONF 2)
at 6 miles Gear Down
Speed Selected 160kt
Flaps 3 and Full
at 4 miles , managed speed .
It bearly comes to a stable approach with the speed , and engines are spooled up
As you say, it barely comes to a stable approach with the speed.
When you put your gear down in selected speed, power comes up to compensate for the drag, as you then go to flap Full you need even more power. The result of this is that when you go for managed speed at 4 miles it takes longer to slow down due to the power setting when you go managed. Result is noisy approach that struggles to be stable by 1000 ft.
If you are at Flap 2 and 160 kts at 4DME your power will be low, take managed speed,gear down, Flap 3 then immediately Full and you will find that by about 1100 ft you are fully configured, speed is within 5 kts and the engines are spooling up nicely......amend as required for tailwinds!