I found the Reverb G1 needed some support over the head, otherwise like your head imprint is showing, it sort of clamps.
This basically holds the weight over the top, and are probably easy to make (a bit of cloth with some velcro).
EDIT: Also, wanted to say while I remember. If you ever get the earphones cutting out it’s because they become loose and the connection in the headband disconnects - you just need a flat headed screwdriver and tighten then up a bit. I had to do that now and again.