Before light turns on.. the plant willnot draw up the stored sugars and what not it made during the night and has stored up in the roots..
I like to let the plant get to right about wilting before cutting... just me tho.
I always water 4 days before i pull out room... that gives my pots enough time to get almost bone dry... i will also hang whole plant for about 12-14 days.. until stems not only almost snap clean but are a brown whiteish tint..
Anything at end of flower will stink... turpin production is skyhigh.. i dont drob below 45 in flower.. starting at 60 and cutting back a few every week till harvest