Presumably, you mean when you have the boots off your feet and are storing them. Personally, I just clamp them lightly on the cuff, and the regular slots on the bottom (but I have to use the widest setting on the bottom because I have wide feet).
I do too, just to keep the top flap from warping. Although once I did buckle them all the way - on the same positions I use when I am skiing and left them in the warm hotel room - I couldn't get my foot in when I unbuckled them! :
Interesting. Historically, I have overtightened when they are not in use. Any thoughts on why this might be bad? My thinking was to do so to give the plastic memory a "closer to the foot" tendency. Thoughts?