My reading of Air Cushion is that you are constantly under its effects. That means that if you are unconscious (unless occultist powers specifically end when unconscious), you are still under its feather fall effect and would still be one size larger for wind effects. It doesn't look like this talent needs to be activated, so unless you turn it off and don't turn it back on, you should be okay.
Wings of Air grants you constant fly in all mechanical ways, and one of those ways is that you get feather fall for 1d6 rounds if it's dispelled (or it's duration expires, which should never functionally happen, but most dispel effects count as duration expiring). I see nothing that would hint that it doesn't maintain this quality as Wings of Air.
