My experience on the A320 is that the aircraft will settle at about 160kts with flap 2 and more or less idle power. At 4 miles drop the gear and the last two stages of flap and at 1000 ft the aircraft is stable with power is coming on nicely. I suspect a 4 degree glideslope would require approach idle only, not an ideal solution.
At 160 kts that's 1100 fpm in calm winds just to stay on the glideslope; 950 ft/min at 140 kts.