I've been thinking on this one for a few days wanting to get some of my flights... if for no other reason than to do post disaster analysis.
I'm glad you said the GoPro wasn't cutting it. I couldn't justify the cost, but knowing it wouldn't work, feels I dodged that bullet.
As an option, I was considering 3D printing something to hold the phone zoomed-in on a baseball cap which I see is pretty common item already on
Thingiverse. I thought if it had some kind of wire "sites" say about 4" apart that drape down in front of my right eye. Closest being a little circle, say 5 mm in diameter and a second one further out is a rectangle giving me a field of view pyramid so I can aim the head/hat/camera at the plane. Does this sound like something that might work or am I deluding myself.