They suggested the county logic, which has helped a bit but it’s just a quite hard girth.
Some confounding things are that the other straight girth he seemed to be less girthy with was both soft but also slightly thinner and had elastic. So it’s possible that it’s not the softness that made a difference but how wide the county girth is or not having elastic.
I could try getting a cover for the logic but my bullets are too short and I think I’d need a new girth in order to fit a thick fleece pad under it.