My wind aim points:
1. Centre kill (surprisingly rarely used)
2. Left/right of centre
3. Inside edge
4, Just outside edge (to be avoided if at all possible) and...
5. "About yea much outside kill" *
* Based on what The Force tells me.
Trouble is quite often The Force is telling me porkies or isn't speaking to me at all!
Don't forget "up a bit/down a bit" for wind eddies off ridges, wind from behind an elevated target etc, etc.
To those who say that aiming relative to the kill size/edge is varying your reference point I say you're right, but every target is at a different range and the wind conditions on each target vary from second to second.