Excellent tips Leviathan !
Regarding the wind drifter: in the times of GPS and therfor well known wind direction and spped plus canopies that have todays performance i guess they're pretty rarely used.. especially out of the big planes (like the Skyvan, Casas etc..)
unless you plan static line round canopy drops
Leviathan:
when you fly an offset jumprun, say 0.5 offset to the north on a 27/09 runway / Jumprun (wind aloft being from the west, OR the dropzone very narrow (had that as well) where do you start your drop ? afer all it's slant range then..