The steel headbands in Beyer headbands are pretty resilient, so you could always (at your own risk) try gently stretching them out over a box or a basketball/soccer ball for a few days.
The 770’s pads are the same dimension as the 880’s, they just have the denser foam that helps them float a bit higher.
Sennheiser is usually a safe choice in this department.
You might try Reddit’s headphone advice board. Lots of friendly folks there who are a bit more obsessive than I am!