Having now flown it a lot, it requires no mixing for knife edge or for anything else for that matter, it tucks ever so slightly to the canopy in knife edge, but I think that is a C of G issue, the 3000Mah batteries I am using are a bit long for the installed battery tray, I will need to cut this out and reposition the velcro to move it back a bit and see if that gets rid of the small amount of tucking.

Mike