Rick,
also as you get closer to the ground the friction effects on the wind can give you a reducing headwind component, most noticeable at night when the mixing layer is drastically reduced or nonexistant. On the 757 you had to be ready to reduce thrust slightly passing about 200ft or the glideslope would give the impression of "dropping away" as you went high. Comparing the reported surface wind with the wind you're experiencing on the way down the slope gives you the first clue, if there's a huge difference.
Having said that, it was about 200-250ft, so you'd only get it in the very final stages of the ILS.
Dunno who told me and if it's accurate or not but when I did my initial ages ago they said that the half scale deflection box you need to be in when at DA/DH is only about 10ft deep and 15ft wide.
Rapid scan, tiny corrections and wiggle your toes (helps you relax a bit)
