angraecum sesquipedale: questions re roots & yellowing leaves

[paris75008]

good morning all, ESP. anyone who grows or has experience with these babies. i've attached 4 pics to help things along.

(a) do you think the leaf yellowing (lowest 2 leaves on 1 fan, lowest leaf on the other) is natural ageing, as w/ phals? if not, what? (i bought her 6 wks ago, potted, and haven't fertilized.)

(b) comparing the 2 pics of leaf details, do you think the plant needs more watering? (i stick her into a bucket of lukewarm/tepid water for 10 min. daily.)

(c) the roots are inflexible and woody, though a few @ the top show a dark green suggesting activity. they don't look @ all like any pics on the internet--and i've researched for quite a few hours. thoughts/opinions?

(d) i grow my catts & oncidium bare root, and they're thriving/blooming w/ a daily 20 min morning shower, hence my thinking that this gal would take to going nekkid too, esp. as her type is reported to dislike root disruption. is my culture markedly different from mounting that she might be reacting badly?

thanks mucho for any thoughts and help.

graham