If you really want to get down, then go for landing config. Slow descent/decellaration down to FL100, gear down at 250, F5 at 230, F15 at 190, F30 at 170. You should now be at around 20 NM, FL100 with a FPA of around 6. And the
VB would then be 5. Sorted. (you'll end up just slightly high at 10 NM.) You could of course use the speed brakes and delay the config abit.
It's quite useful to know roughly what kind of FPAs you get with different configs. 280 kts is, as you know, around 3.
F5+speedbrake gives you around 4,5.
Landing config, typically 6.